diff --git a/gmail/snippet/settings snippets/update_signature.py b/gmail/snippet/settings snippets/update_signature.py
new file mode 100644
index 00000000..bfa93c37
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+++ b/gmail/snippet/settings snippets/update_signature.py	
@@ -0,0 +1,68 @@
+"""Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+# [START gmail_update_signature]
+
+from __future__ import print_function
+
+import google.auth
+from googleapiclient.discovery import build
+from googleapiclient.errors import HttpError
+
+
+def update_signature():
+    """Create and update signature in gmail.
+    Returns:Draft object, including updated signature.
+
+    Load pre-authorized user credentials from the environment.
+    TODO(developer) - See https://developers.google.com/identity
+    for guides on implementing OAuth2 for the application.
+    """
+    creds, _ = google.auth.default()
+
+    try:
+        # create gmail api client
+        service = build('gmail', 'v1', credentials=creds)
+
+        primary_alias = None
+
+        # pylint: disable=E1101
+        aliases = service.users().settings().sendAs().list(userId='me')\
+            .execute()
+        for alias in aliases.get('sendAs'):
+            if alias.get('isPrimary'):
+                primary_alias = alias
+                break
+
+        send_as_configuration = {
+            'displayName': primary_alias.get('sendAsEmail'),
+            'signature': 'Automated Signature'
+        }
+
+        # pylint: disable=E1101
+        result = service.users().settings().sendAs() \
+            .patch(userId='me', sendAsEmail=primary_alias.get('sendAsEmail'),
+                   body=send_as_configuration).execute()
+        print(F'Updated signature for: {result.get("displayName")}')
+
+    except HttpError as error:
+        print(F'An error occurred: {error}')
+        result = None
+
+    return result.get('signature')
+
+
+if __name__ == '__main__':
+    update_signature()
+# [END gmail_update_signature]