diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6bb50d96..13a0da6b 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-    ".": "2.9.0"
+    ".": "2.9.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 85aa6ba3..c16ae839 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [2.9.1](https://github.com/googleapis/python-documentai/compare/v2.9.0...v2.9.1) (2023-01-20)
+
+
+### Bug Fixes
+
+* Add context manager return types ([61256d1](https://github.com/googleapis/python-documentai/commit/61256d1728e17dc8b04cd4166e286a4f76c6018a))
+
+
+### Documentation
+
+* Add documentation for enums ([61256d1](https://github.com/googleapis/python-documentai/commit/61256d1728e17dc8b04cd4166e286a4f76c6018a))
+
 ## [2.9.0](https://github.com/googleapis/python-documentai/compare/v2.8.0...v2.9.0) (2023-01-17)
 
 
diff --git a/google/cloud/documentai/gapic_version.py b/google/cloud/documentai/gapic_version.py
index 60aeb18d..18081a7d 100644
--- a/google/cloud/documentai/gapic_version.py
+++ b/google/cloud/documentai/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.9.0"  # {x-release-please-version}
+__version__ = "2.9.1"  # {x-release-please-version}
diff --git a/google/cloud/documentai_v1/gapic_version.py b/google/cloud/documentai_v1/gapic_version.py
index 60aeb18d..18081a7d 100644
--- a/google/cloud/documentai_v1/gapic_version.py
+++ b/google/cloud/documentai_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.9.0"  # {x-release-please-version}
+__version__ = "2.9.1"  # {x-release-please-version}
diff --git a/google/cloud/documentai_v1/services/document_processor_service/client.py b/google/cloud/documentai_v1/services/document_processor_service/client.py
index 165cce11..255b9828 100644
--- a/google/cloud/documentai_v1/services/document_processor_service/client.py
+++ b/google/cloud/documentai_v1/services/document_processor_service/client.py
@@ -2623,7 +2623,7 @@ def sample_review_document():
         # Done; return the response.
         return response
 
-    def __enter__(self):
+    def __enter__(self) -> "DocumentProcessorServiceClient":
         return self
 
     def __exit__(self, type, value, traceback):
diff --git a/google/cloud/documentai_v1/types/document.py b/google/cloud/documentai_v1/types/document.py
index 6e1090aa..00ad692c 100644
--- a/google/cloud/documentai_v1/types/document.py
+++ b/google/cloud/documentai_v1/types/document.py
@@ -396,7 +396,25 @@ class Layout(proto.Message):
             """
 
             class Orientation(proto.Enum):
-                r"""Detected human reading orientation."""
+                r"""Detected human reading orientation.
+
+                Values:
+                    ORIENTATION_UNSPECIFIED (0):
+                        Unspecified orientation.
+                    PAGE_UP (1):
+                        Orientation is aligned with page up.
+                    PAGE_RIGHT (2):
+                        Orientation is aligned with page right.
+                        Turn the head 90 degrees clockwise from upright
+                        to read.
+                    PAGE_DOWN (3):
+                        Orientation is aligned with page down.
+                        Turn the head 180 degrees from upright to read.
+                    PAGE_LEFT (4):
+                        Orientation is aligned with page left.
+                        Turn the head 90 degrees counterclockwise from
+                        upright to read.
+                """
                 ORIENTATION_UNSPECIFIED = 0
                 PAGE_UP = 1
                 PAGE_RIGHT = 2
@@ -551,7 +569,19 @@ class DetectedBreak(proto.Message):
                 """
 
                 class Type(proto.Enum):
-                    r"""Enum to denote the type of break found."""
+                    r"""Enum to denote the type of break found.
+
+                    Values:
+                        TYPE_UNSPECIFIED (0):
+                            Unspecified break type.
+                        SPACE (1):
+                            A single whitespace.
+                        WIDE_SPACE (2):
+                            A wider whitespace.
+                        HYPHEN (3):
+                            A hyphen that indicates that a token has been
+                            split across lines.
+                    """
                     TYPE_UNSPECIFIED = 0
                     SPACE = 1
                     WIDE_SPACE = 2
@@ -1344,7 +1374,40 @@ class PageRef(proto.Message):
             """
 
             class LayoutType(proto.Enum):
-                r"""The type of layout that is being referenced."""
+                r"""The type of layout that is being referenced.
+
+                Values:
+                    LAYOUT_TYPE_UNSPECIFIED (0):
+                        Layout Unspecified.
+                    BLOCK (1):
+                        References a
+                        [Page.blocks][google.cloud.documentai.v1.Document.Page.blocks]
+                        element.
+                    PARAGRAPH (2):
+                        References a
+                        [Page.paragraphs][google.cloud.documentai.v1.Document.Page.paragraphs]
+                        element.
+                    LINE (3):
+                        References a
+                        [Page.lines][google.cloud.documentai.v1.Document.Page.lines]
+                        element.
+                    TOKEN (4):
+                        References a
+                        [Page.tokens][google.cloud.documentai.v1.Document.Page.tokens]
+                        element.
+                    VISUAL_ELEMENT (5):
+                        References a
+                        [Page.visual_elements][google.cloud.documentai.v1.Document.Page.visual_elements]
+                        element.
+                    TABLE (6):
+                        Refrrences a
+                        [Page.tables][google.cloud.documentai.v1.Document.Page.tables]
+                        element.
+                    FORM_FIELD (7):
+                        References a
+                        [Page.form_fields][google.cloud.documentai.v1.Document.Page.form_fields]
+                        element.
+                """
                 LAYOUT_TYPE_UNSPECIFIED = 0
                 BLOCK = 1
                 PARAGRAPH = 2
@@ -1404,6 +1467,26 @@ class Provenance(proto.Message):
         class OperationType(proto.Enum):
             r"""If a processor or agent does an explicit operation on
             existing elements.
+
+            Values:
+                OPERATION_TYPE_UNSPECIFIED (0):
+                    Operation type unspecified. If no operation is specified a
+                    provenance entry is simply used to match against a
+                    ``parent``.
+                ADD (1):
+                    Add an element.
+                REMOVE (2):
+                    Remove an element identified by ``parent``.
+                REPLACE (3):
+                    Replace an element identified by ``parent``.
+                EVAL_REQUESTED (4):
+                    Request human review for the element identified by
+                    ``parent``.
+                EVAL_APPROVED (5):
+                    Element is reviewed and approved at human
+                    review, confidence will be set to 1.0.
+                EVAL_SKIPPED (6):
+                    Element is skipped in the validation process.
             """
             OPERATION_TYPE_UNSPECIFIED = 0
             ADD = 1
diff --git a/google/cloud/documentai_v1/types/document_processor_service.py b/google/cloud/documentai_v1/types/document_processor_service.py
index c830a017..ec45701e 100644
--- a/google/cloud/documentai_v1/types/document_processor_service.py
+++ b/google/cloud/documentai_v1/types/document_processor_service.py
@@ -161,7 +161,27 @@ class HumanReviewStatus(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The final state of human review on a processed document."""
+        r"""The final state of human review on a processed document.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                Human review state is unspecified. Most
+                likely due to an internal error.
+            SKIPPED (1):
+                Human review is skipped for the document.
+                This can happen because human review is not
+                enabled on the processor or the processing
+                request has been set to skip this document.
+            VALIDATION_PASSED (2):
+                Human review validation is triggered and
+                passed, so no review is needed.
+            IN_PROGRESS (3):
+                Human review validation is triggered and the
+                document is under review.
+            ERROR (4):
+                Some error happened during triggering human review, see the
+                [state_message] for details.
+        """
         STATE_UNSPECIFIED = 0
         SKIPPED = 1
         VALIDATION_PASSED = 2
@@ -272,7 +292,25 @@ class BatchProcessMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""Possible states of the batch processing operation."""
+        r"""Possible states of the batch processing operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The default value. This value is used if the
+                state is omitted.
+            WAITING (1):
+                Request operation is waiting for scheduling.
+            RUNNING (2):
+                Request is being processed.
+            SUCCEEDED (3):
+                The batch processing completed successfully.
+            CANCELLING (4):
+                The batch processing was being cancelled.
+            CANCELLED (5):
+                The batch processing was cancelled.
+            FAILED (6):
+                The batch processing has failed.
+        """
         STATE_UNSPECIFIED = 0
         WAITING = 1
         RUNNING = 2
@@ -918,7 +956,17 @@ class ReviewDocumentRequest(proto.Message):
     """
 
     class Priority(proto.Enum):
-        r"""The priority level of the human review task."""
+        r"""The priority level of the human review task.
+
+        Values:
+            DEFAULT (0):
+                The default priority level.
+            URGENT (1):
+                The urgent priority level. The labeling
+                manager should allocate labeler resource to the
+                urgent task queue to respect this priority
+                level.
+        """
         DEFAULT = 0
         URGENT = 1
 
@@ -963,7 +1011,18 @@ class ReviewDocumentResponse(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""Possible states of the review operation."""
+        r"""Possible states of the review operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The default value. This value is used if the
+                state is omitted.
+            REJECTED (1):
+                The review operation is rejected by the
+                reviewer.
+            SUCCEEDED (2):
+                The review operation is succeeded.
+        """
         STATE_UNSPECIFIED = 0
         REJECTED = 1
         SUCCEEDED = 2
diff --git a/google/cloud/documentai_v1/types/document_schema.py b/google/cloud/documentai_v1/types/document_schema.py
index f81539dc..2a2bba61 100644
--- a/google/cloud/documentai_v1/types/document_schema.py
+++ b/google/cloud/documentai_v1/types/document_schema.py
@@ -119,6 +119,22 @@ class OccurrenceType(proto.Enum):
                 r"""Types of occurrences of the entity type in the document.
                 Note: this represents the number of instances of an entity
                 types, not number of mentions of a given entity instance.
+
+                Values:
+                    OCCURRENCE_TYPE_UNSPECIFIED (0):
+                        Unspecified occurrence type.
+                    OPTIONAL_ONCE (1):
+                        There will be zero or one instance of this
+                        entity type.
+                    OPTIONAL_MULTIPLE (2):
+                        The entity type will appear zero or multiple
+                        times.
+                    REQUIRED_ONCE (3):
+                        The entity type will only appear exactly
+                        once.
+                    REQUIRED_MULTIPLE (4):
+                        The entity type will appear once or more
+                        times.
                 """
                 OCCURRENCE_TYPE_UNSPECIFIED = 0
                 OPTIONAL_ONCE = 1
diff --git a/google/cloud/documentai_v1/types/operation_metadata.py b/google/cloud/documentai_v1/types/operation_metadata.py
index cf69485d..406d5581 100644
--- a/google/cloud/documentai_v1/types/operation_metadata.py
+++ b/google/cloud/documentai_v1/types/operation_metadata.py
@@ -44,7 +44,22 @@ class CommonOperationMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""State of the longrunning operation."""
+        r"""State of the longrunning operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                Unspecified state.
+            RUNNING (1):
+                Operation is still running.
+            CANCELLING (2):
+                Operation is being cancelled.
+            SUCCEEDED (3):
+                Operation succeeded.
+            FAILED (4):
+                Operation failed.
+            CANCELLED (5):
+                Operation is cancelled.
+        """
         STATE_UNSPECIFIED = 0
         RUNNING = 1
         CANCELLING = 2
diff --git a/google/cloud/documentai_v1/types/processor.py b/google/cloud/documentai_v1/types/processor.py
index 876b04e1..b61d11f0 100644
--- a/google/cloud/documentai_v1/types/processor.py
+++ b/google/cloud/documentai_v1/types/processor.py
@@ -64,7 +64,30 @@ class ProcessorVersion(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The possible states of the processor version."""
+        r"""The possible states of the processor version.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The processor version is in an unspecified
+                state.
+            DEPLOYED (1):
+                The processor version is deployed and can be
+                used for processing.
+            DEPLOYING (2):
+                The processor version is being deployed.
+            UNDEPLOYED (3):
+                The processor version is not deployed and
+                cannot be used for processing.
+            UNDEPLOYING (4):
+                The processor version is being undeployed.
+            CREATING (5):
+                The processor version is being created.
+            DELETING (6):
+                The processor version is being deleted.
+            FAILED (7):
+                The processor version failed and is in an
+                indeterminate state.
+        """
         STATE_UNSPECIFIED = 0
         DEPLOYED = 1
         DEPLOYING = 2
@@ -171,7 +194,41 @@ class Processor(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The possible states of the processor."""
+        r"""The possible states of the processor.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The processor is in an unspecified state.
+            ENABLED (1):
+                The processor is enabled, i.e., has an
+                enabled version which can currently serve
+                processing requests and all the feature
+                dependencies have been successfully initialized.
+            DISABLED (2):
+                The processor is disabled.
+            ENABLING (3):
+                The processor is being enabled, will become ``ENABLED`` if
+                successful.
+            DISABLING (4):
+                The processor is being disabled, will become ``DISABLED`` if
+                successful.
+            CREATING (5):
+                The processor is being created, will become either
+                ``ENABLED`` (for successful creation) or ``FAILED`` (for
+                failed ones). Once a processor is in this state, it can then
+                be used for document processing, but the feature
+                dependencies of the processor might not be fully created
+                yet.
+            FAILED (6):
+                The processor failed during creation or
+                initialization of feature dependencies. The user
+                should delete the processor and recreate one as
+                all the functionalities of the processor are
+                disabled.
+            DELETING (7):
+                The processor is being deleted, will be
+                removed if successful.
+        """
         STATE_UNSPECIFIED = 0
         ENABLED = 1
         DISABLED = 2
diff --git a/google/cloud/documentai_v1beta2/gapic_version.py b/google/cloud/documentai_v1beta2/gapic_version.py
index 60aeb18d..18081a7d 100644
--- a/google/cloud/documentai_v1beta2/gapic_version.py
+++ b/google/cloud/documentai_v1beta2/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.9.0"  # {x-release-please-version}
+__version__ = "2.9.1"  # {x-release-please-version}
diff --git a/google/cloud/documentai_v1beta2/services/document_understanding_service/client.py b/google/cloud/documentai_v1beta2/services/document_understanding_service/client.py
index de52e8a8..1e1496e9 100644
--- a/google/cloud/documentai_v1beta2/services/document_understanding_service/client.py
+++ b/google/cloud/documentai_v1beta2/services/document_understanding_service/client.py
@@ -646,7 +646,7 @@ def sample_process_document():
         # Done; return the response.
         return response
 
-    def __enter__(self):
+    def __enter__(self) -> "DocumentUnderstandingServiceClient":
         return self
 
     def __exit__(self, type, value, traceback):
diff --git a/google/cloud/documentai_v1beta2/types/document.py b/google/cloud/documentai_v1beta2/types/document.py
index 89633a8c..541ad865 100644
--- a/google/cloud/documentai_v1beta2/types/document.py
+++ b/google/cloud/documentai_v1beta2/types/document.py
@@ -340,7 +340,25 @@ class Layout(proto.Message):
             """
 
             class Orientation(proto.Enum):
-                r"""Detected human reading orientation."""
+                r"""Detected human reading orientation.
+
+                Values:
+                    ORIENTATION_UNSPECIFIED (0):
+                        Unspecified orientation.
+                    PAGE_UP (1):
+                        Orientation is aligned with page up.
+                    PAGE_RIGHT (2):
+                        Orientation is aligned with page right.
+                        Turn the head 90 degrees clockwise from upright
+                        to read.
+                    PAGE_DOWN (3):
+                        Orientation is aligned with page down.
+                        Turn the head 180 degrees from upright to read.
+                    PAGE_LEFT (4):
+                        Orientation is aligned with page left.
+                        Turn the head 90 degrees counterclockwise from
+                        upright to read.
+                """
                 ORIENTATION_UNSPECIFIED = 0
                 PAGE_UP = 1
                 PAGE_RIGHT = 2
@@ -479,7 +497,19 @@ class DetectedBreak(proto.Message):
                 """
 
                 class Type(proto.Enum):
-                    r"""Enum to denote the type of break found."""
+                    r"""Enum to denote the type of break found.
+
+                    Values:
+                        TYPE_UNSPECIFIED (0):
+                            Unspecified break type.
+                        SPACE (1):
+                            A single whitespace.
+                        WIDE_SPACE (2):
+                            A wider whitespace.
+                        HYPHEN (3):
+                            A hyphen that indicates that a token has been
+                            split across lines.
+                    """
                     TYPE_UNSPECIFIED = 0
                     SPACE = 1
                     WIDE_SPACE = 2
@@ -961,7 +991,40 @@ class PageRef(proto.Message):
             """
 
             class LayoutType(proto.Enum):
-                r"""The type of layout that is being referenced."""
+                r"""The type of layout that is being referenced.
+
+                Values:
+                    LAYOUT_TYPE_UNSPECIFIED (0):
+                        Layout Unspecified.
+                    BLOCK (1):
+                        References a
+                        [Page.blocks][google.cloud.documentai.v1beta2.Document.Page.blocks]
+                        element.
+                    PARAGRAPH (2):
+                        References a
+                        [Page.paragraphs][google.cloud.documentai.v1beta2.Document.Page.paragraphs]
+                        element.
+                    LINE (3):
+                        References a
+                        [Page.lines][google.cloud.documentai.v1beta2.Document.Page.lines]
+                        element.
+                    TOKEN (4):
+                        References a
+                        [Page.tokens][google.cloud.documentai.v1beta2.Document.Page.tokens]
+                        element.
+                    VISUAL_ELEMENT (5):
+                        References a
+                        [Page.visual_elements][google.cloud.documentai.v1beta2.Document.Page.visual_elements]
+                        element.
+                    TABLE (6):
+                        Refrrences a
+                        [Page.tables][google.cloud.documentai.v1beta2.Document.Page.tables]
+                        element.
+                    FORM_FIELD (7):
+                        References a
+                        [Page.form_fields][google.cloud.documentai.v1beta2.Document.Page.form_fields]
+                        element.
+                """
                 LAYOUT_TYPE_UNSPECIFIED = 0
                 BLOCK = 1
                 PARAGRAPH = 2
diff --git a/google/cloud/documentai_v1beta2/types/document_understanding.py b/google/cloud/documentai_v1beta2/types/document_understanding.py
index 2c38cff7..725d48e3 100644
--- a/google/cloud/documentai_v1beta2/types/document_understanding.py
+++ b/google/cloud/documentai_v1beta2/types/document_understanding.py
@@ -540,7 +540,25 @@ class OperationMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r""""""
+        r"""
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The default value. This value is used if the
+                state is omitted.
+            ACCEPTED (1):
+                Request is received.
+            WAITING (2):
+                Request operation is waiting for scheduling.
+            RUNNING (3):
+                Request is being processed.
+            SUCCEEDED (4):
+                The batch processing completed successfully.
+            CANCELLED (5):
+                The batch processing was cancelled.
+            FAILED (6):
+                The batch processing has failed.
+        """
         STATE_UNSPECIFIED = 0
         ACCEPTED = 1
         WAITING = 2
diff --git a/google/cloud/documentai_v1beta3/gapic_version.py b/google/cloud/documentai_v1beta3/gapic_version.py
index 60aeb18d..18081a7d 100644
--- a/google/cloud/documentai_v1beta3/gapic_version.py
+++ b/google/cloud/documentai_v1beta3/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.9.0"  # {x-release-please-version}
+__version__ = "2.9.1"  # {x-release-please-version}
diff --git a/google/cloud/documentai_v1beta3/services/document_processor_service/client.py b/google/cloud/documentai_v1beta3/services/document_processor_service/client.py
index 77f1fe8e..b07d558f 100644
--- a/google/cloud/documentai_v1beta3/services/document_processor_service/client.py
+++ b/google/cloud/documentai_v1beta3/services/document_processor_service/client.py
@@ -3139,7 +3139,7 @@ def sample_list_evaluations():
         # Done; return the response.
         return response
 
-    def __enter__(self):
+    def __enter__(self) -> "DocumentProcessorServiceClient":
         return self
 
     def __exit__(self, type, value, traceback):
diff --git a/google/cloud/documentai_v1beta3/types/document.py b/google/cloud/documentai_v1beta3/types/document.py
index 7525315b..aac98f6a 100644
--- a/google/cloud/documentai_v1beta3/types/document.py
+++ b/google/cloud/documentai_v1beta3/types/document.py
@@ -396,7 +396,25 @@ class Layout(proto.Message):
             """
 
             class Orientation(proto.Enum):
-                r"""Detected human reading orientation."""
+                r"""Detected human reading orientation.
+
+                Values:
+                    ORIENTATION_UNSPECIFIED (0):
+                        Unspecified orientation.
+                    PAGE_UP (1):
+                        Orientation is aligned with page up.
+                    PAGE_RIGHT (2):
+                        Orientation is aligned with page right.
+                        Turn the head 90 degrees clockwise from upright
+                        to read.
+                    PAGE_DOWN (3):
+                        Orientation is aligned with page down.
+                        Turn the head 180 degrees from upright to read.
+                    PAGE_LEFT (4):
+                        Orientation is aligned with page left.
+                        Turn the head 90 degrees counterclockwise from
+                        upright to read.
+                """
                 ORIENTATION_UNSPECIFIED = 0
                 PAGE_UP = 1
                 PAGE_RIGHT = 2
@@ -554,7 +572,19 @@ class DetectedBreak(proto.Message):
                 """
 
                 class Type(proto.Enum):
-                    r"""Enum to denote the type of break found."""
+                    r"""Enum to denote the type of break found.
+
+                    Values:
+                        TYPE_UNSPECIFIED (0):
+                            Unspecified break type.
+                        SPACE (1):
+                            A single whitespace.
+                        WIDE_SPACE (2):
+                            A wider whitespace.
+                        HYPHEN (3):
+                            A hyphen that indicates that a token has been
+                            split across lines.
+                    """
                     TYPE_UNSPECIFIED = 0
                     SPACE = 1
                     WIDE_SPACE = 2
@@ -1348,7 +1378,40 @@ class PageRef(proto.Message):
             """
 
             class LayoutType(proto.Enum):
-                r"""The type of layout that is being referenced."""
+                r"""The type of layout that is being referenced.
+
+                Values:
+                    LAYOUT_TYPE_UNSPECIFIED (0):
+                        Layout Unspecified.
+                    BLOCK (1):
+                        References a
+                        [Page.blocks][google.cloud.documentai.v1beta3.Document.Page.blocks]
+                        element.
+                    PARAGRAPH (2):
+                        References a
+                        [Page.paragraphs][google.cloud.documentai.v1beta3.Document.Page.paragraphs]
+                        element.
+                    LINE (3):
+                        References a
+                        [Page.lines][google.cloud.documentai.v1beta3.Document.Page.lines]
+                        element.
+                    TOKEN (4):
+                        References a
+                        [Page.tokens][google.cloud.documentai.v1beta3.Document.Page.tokens]
+                        element.
+                    VISUAL_ELEMENT (5):
+                        References a
+                        [Page.visual_elements][google.cloud.documentai.v1beta3.Document.Page.visual_elements]
+                        element.
+                    TABLE (6):
+                        Refrrences a
+                        [Page.tables][google.cloud.documentai.v1beta3.Document.Page.tables]
+                        element.
+                    FORM_FIELD (7):
+                        References a
+                        [Page.form_fields][google.cloud.documentai.v1beta3.Document.Page.form_fields]
+                        element.
+                """
                 LAYOUT_TYPE_UNSPECIFIED = 0
                 BLOCK = 1
                 PARAGRAPH = 2
@@ -1408,6 +1471,26 @@ class Provenance(proto.Message):
         class OperationType(proto.Enum):
             r"""If a processor or agent does an explicit operation on
             existing elements.
+
+            Values:
+                OPERATION_TYPE_UNSPECIFIED (0):
+                    Operation type unspecified. If no operation is specified a
+                    provenance entry is simply used to match against a
+                    ``parent``.
+                ADD (1):
+                    Add an element.
+                REMOVE (2):
+                    Remove an element identified by ``parent``.
+                REPLACE (3):
+                    Replace an element identified by ``parent``.
+                EVAL_REQUESTED (4):
+                    Request human review for the element identified by
+                    ``parent``.
+                EVAL_APPROVED (5):
+                    Element is reviewed and approved at human
+                    review, confidence will be set to 1.0.
+                EVAL_SKIPPED (6):
+                    Element is skipped in the validation process.
             """
             OPERATION_TYPE_UNSPECIFIED = 0
             ADD = 1
diff --git a/google/cloud/documentai_v1beta3/types/document_processor_service.py b/google/cloud/documentai_v1beta3/types/document_processor_service.py
index 61d83f21..22af3e2f 100644
--- a/google/cloud/documentai_v1beta3/types/document_processor_service.py
+++ b/google/cloud/documentai_v1beta3/types/document_processor_service.py
@@ -203,7 +203,27 @@ class HumanReviewStatus(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The final state of human review on a processed document."""
+        r"""The final state of human review on a processed document.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                Human review state is unspecified. Most
+                likely due to an internal error.
+            SKIPPED (1):
+                Human review is skipped for the document.
+                This can happen because human review is not
+                enabled on the processor or the processing
+                request has been set to skip this document.
+            VALIDATION_PASSED (2):
+                Human review validation is triggered and
+                passed, so no review is needed.
+            IN_PROGRESS (3):
+                Human review validation is triggered and the
+                document is under review.
+            ERROR (4):
+                Some error happened during triggering human review, see the
+                [state_message] for details.
+        """
         STATE_UNSPECIFIED = 0
         SKIPPED = 1
         VALIDATION_PASSED = 2
@@ -384,7 +404,25 @@ class BatchProcessMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""Possible states of the batch processing operation."""
+        r"""Possible states of the batch processing operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The default value. This value is used if the
+                state is omitted.
+            WAITING (1):
+                Request operation is waiting for scheduling.
+            RUNNING (2):
+                Request is being processed.
+            SUCCEEDED (3):
+                The batch processing completed successfully.
+            CANCELLING (4):
+                The batch processing was being cancelled.
+            CANCELLED (5):
+                The batch processing was cancelled.
+            FAILED (6):
+                The batch processing has failed.
+        """
         STATE_UNSPECIFIED = 0
         WAITING = 1
         RUNNING = 2
@@ -1200,7 +1238,17 @@ class ReviewDocumentRequest(proto.Message):
     """
 
     class Priority(proto.Enum):
-        r"""The priority level of the human review task."""
+        r"""The priority level of the human review task.
+
+        Values:
+            DEFAULT (0):
+                The default priority level.
+            URGENT (1):
+                The urgent priority level. The labeling
+                manager should allocate labeler resource to the
+                urgent task queue to respect this priority
+                level.
+        """
         DEFAULT = 0
         URGENT = 1
 
@@ -1250,7 +1298,18 @@ class ReviewDocumentResponse(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""Possible states of the review operation."""
+        r"""Possible states of the review operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The default value. This value is used if the
+                state is omitted.
+            REJECTED (1):
+                The review operation is rejected by the
+                reviewer.
+            SUCCEEDED (2):
+                The review operation is succeeded.
+        """
         STATE_UNSPECIFIED = 0
         REJECTED = 1
         SUCCEEDED = 2
@@ -1293,7 +1352,22 @@ class ReviewDocumentOperationMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""State of the longrunning operation."""
+        r"""State of the longrunning operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                Unspecified state.
+            RUNNING (1):
+                Operation is still running.
+            CANCELLING (2):
+                Operation is being cancelled.
+            SUCCEEDED (3):
+                Operation succeeded.
+            FAILED (4):
+                Operation failed.
+            CANCELLED (5):
+                Operation is cancelled.
+        """
         STATE_UNSPECIFIED = 0
         RUNNING = 1
         CANCELLING = 2
diff --git a/google/cloud/documentai_v1beta3/types/document_schema.py b/google/cloud/documentai_v1beta3/types/document_schema.py
index 0092fcba..e84ee3bc 100644
--- a/google/cloud/documentai_v1beta3/types/document_schema.py
+++ b/google/cloud/documentai_v1beta3/types/document_schema.py
@@ -119,6 +119,22 @@ class OccurrenceType(proto.Enum):
                 r"""Types of occurrences of the entity type in the document.
                 Note: this represents the number of instances of an entity
                 types, not number of mentions of a given entity instance.
+
+                Values:
+                    OCCURRENCE_TYPE_UNSPECIFIED (0):
+                        Unspecified occurrence type.
+                    OPTIONAL_ONCE (1):
+                        There will be zero or one instance of this
+                        entity type.
+                    OPTIONAL_MULTIPLE (2):
+                        The entity type will appear zero or multiple
+                        times.
+                    REQUIRED_ONCE (3):
+                        The entity type will only appear exactly
+                        once.
+                    REQUIRED_MULTIPLE (4):
+                        The entity type will appear once or more
+                        times.
                 """
                 OCCURRENCE_TYPE_UNSPECIFIED = 0
                 OPTIONAL_ONCE = 1
diff --git a/google/cloud/documentai_v1beta3/types/evaluation.py b/google/cloud/documentai_v1beta3/types/evaluation.py
index c0cd3b61..b73c0b70 100644
--- a/google/cloud/documentai_v1beta3/types/evaluation.py
+++ b/google/cloud/documentai_v1beta3/types/evaluation.py
@@ -212,7 +212,23 @@ class MultiConfidenceMetrics(proto.Message):
         """
 
         class MetricsType(proto.Enum):
-            r"""A type that determines how metrics should be interpreted."""
+            r"""A type that determines how metrics should be interpreted.
+
+            Values:
+                METRICS_TYPE_UNSPECIFIED (0):
+                    The metrics type is unspecified. By default,
+                    metrics without a particular specification are
+                    for leaf entity types (i.e., top-level entity
+                    types without child types, or child types which
+                    are not parent types themselves).
+                AGGREGATE (1):
+                    Indicates whether metrics for this particular
+                    label type represent an aggregate of metrics for
+                    other types instead of being based on actual
+                    TP/FP/FN values for the label type. Metrics for
+                    parent (i.e., non-leaf) entity types are an
+                    aggregate of metrics for their children.
+            """
             METRICS_TYPE_UNSPECIFIED = 0
             AGGREGATE = 1
 
diff --git a/google/cloud/documentai_v1beta3/types/operation_metadata.py b/google/cloud/documentai_v1beta3/types/operation_metadata.py
index e1a6b403..3e59c619 100644
--- a/google/cloud/documentai_v1beta3/types/operation_metadata.py
+++ b/google/cloud/documentai_v1beta3/types/operation_metadata.py
@@ -44,7 +44,22 @@ class CommonOperationMetadata(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""State of the longrunning operation."""
+        r"""State of the longrunning operation.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                Unspecified state.
+            RUNNING (1):
+                Operation is still running.
+            CANCELLING (2):
+                Operation is being cancelled.
+            SUCCEEDED (3):
+                Operation succeeded.
+            FAILED (4):
+                Operation failed.
+            CANCELLED (5):
+                Operation is cancelled.
+        """
         STATE_UNSPECIFIED = 0
         RUNNING = 1
         CANCELLING = 2
diff --git a/google/cloud/documentai_v1beta3/types/processor.py b/google/cloud/documentai_v1beta3/types/processor.py
index c0510d67..0a4eb1f3 100644
--- a/google/cloud/documentai_v1beta3/types/processor.py
+++ b/google/cloud/documentai_v1beta3/types/processor.py
@@ -64,7 +64,30 @@ class ProcessorVersion(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The possible states of the processor version."""
+        r"""The possible states of the processor version.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The processor version is in an unspecified
+                state.
+            DEPLOYED (1):
+                The processor version is deployed and can be
+                used for processing.
+            DEPLOYING (2):
+                The processor version is being deployed.
+            UNDEPLOYED (3):
+                The processor version is not deployed and
+                cannot be used for processing.
+            UNDEPLOYING (4):
+                The processor version is being undeployed.
+            CREATING (5):
+                The processor version is being created.
+            DELETING (6):
+                The processor version is being deleted.
+            FAILED (7):
+                The processor version failed and is in an
+                indeterminate state.
+        """
         STATE_UNSPECIFIED = 0
         DEPLOYED = 1
         DEPLOYING = 2
@@ -171,7 +194,41 @@ class Processor(proto.Message):
     """
 
     class State(proto.Enum):
-        r"""The possible states of the processor."""
+        r"""The possible states of the processor.
+
+        Values:
+            STATE_UNSPECIFIED (0):
+                The processor is in an unspecified state.
+            ENABLED (1):
+                The processor is enabled, i.e., has an
+                enabled version which can currently serve
+                processing requests and all the feature
+                dependencies have been successfully initialized.
+            DISABLED (2):
+                The processor is disabled.
+            ENABLING (3):
+                The processor is being enabled, will become ``ENABLED`` if
+                successful.
+            DISABLING (4):
+                The processor is being disabled, will become ``DISABLED`` if
+                successful.
+            CREATING (5):
+                The processor is being created, will become either
+                ``ENABLED`` (for successful creation) or ``FAILED`` (for
+                failed ones). Once a processor is in this state, it can then
+                be used for document processing, but the feature
+                dependencies of the processor might not be fully created
+                yet.
+            FAILED (6):
+                The processor failed during creation or
+                initialization of feature dependencies. The user
+                should delete the processor and recreate one as
+                all the functionalities of the processor are
+                disabled.
+            DELETING (7):
+                The processor is being deleted, will be
+                removed if successful.
+        """
         STATE_UNSPECIFIED = 0
         ENABLED = 1
         DISABLED = 2
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1.json b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1.json
index 48cfeb17..2baa0243 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-documentai",
-    "version": "2.9.0"
+    "version": "2.9.1"
   },
   "snippets": [
     {
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta2.json b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta2.json
index 10c94686..15972380 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta2.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta2.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-documentai",
-    "version": "2.9.0"
+    "version": "2.9.1"
   },
   "snippets": [
     {
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta3.json b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta3.json
index c8212825..42474b5f 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta3.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.documentai.v1beta3.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-documentai",
-    "version": "2.9.0"
+    "version": "2.9.1"
   },
   "snippets": [
     {