diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index a47e1ffb1a6afb1..4e6eb30b275ad95 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -1169,7 +1169,8 @@ Sequence types also support the following methods:
    :no-contents-entry:
    :no-index-entry:
    :no-typesetting:
-.. method:: sequence.index(value[, start[, stop]])
+.. method:: sequence.index(value, /)
+            sequence.index(value, start=0, stop=sys.maxsize, /)
 
    Return the index of the first occurrence of *value* in *sequence*.
 
diff --git a/Objects/clinic/unicodeobject.c.h b/Objects/clinic/unicodeobject.c.h
index d0753b38843fccf..5a967c0f633302a 100644
--- a/Objects/clinic/unicodeobject.c.h
+++ b/Objects/clinic/unicodeobject.c.h
@@ -138,7 +138,7 @@ unicode_center(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
 }
 
 PyDoc_STRVAR(unicode_count__doc__,
-"count($self, sub[, start[, end]], /)\n"
+"count($self, sub, start=0, end=sys.maxsize, /)\n"
 "--\n"
 "\n"
 "Return the number of non-overlapping occurrences of substring sub in string S[start:end].\n"
@@ -365,7 +365,7 @@ unicode_expandtabs(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
 }
 
 PyDoc_STRVAR(unicode_find__doc__,
-"find($self, sub[, start[, end]], /)\n"
+"find($self, sub, start=0, end=sys.maxsize, /)\n"
 "--\n"
 "\n"
 "Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end].\n"
@@ -421,7 +421,7 @@ unicode_find(PyObject *str, PyObject *const *args, Py_ssize_t nargs)
 }
 
 PyDoc_STRVAR(unicode_index__doc__,
-"index($self, sub[, start[, end]], /)\n"
+"index($self, sub, start=0, end=sys.maxsize, /)\n"
 "--\n"
 "\n"
 "Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end].\n"
@@ -1072,7 +1072,7 @@ unicode_removesuffix(PyObject *self, PyObject *arg)
 }
 
 PyDoc_STRVAR(unicode_rfind__doc__,
-"rfind($self, sub[, start[, end]], /)\n"
+"rfind($self, sub, start=0, end=sys.maxsize, /)\n"
 "--\n"
 "\n"
 "Return the highest index in S where substring sub is found, such that sub is contained within S[start:end].\n"
@@ -1128,7 +1128,7 @@ unicode_rfind(PyObject *str, PyObject *const *args, Py_ssize_t nargs)
 }
 
 PyDoc_STRVAR(unicode_rindex__doc__,
-"rindex($self, sub[, start[, end]], /)\n"
+"rindex($self, sub, start=0, end=sys.maxsize, /)\n"
 "--\n"
 "\n"
 "Return the highest index in S where substring sub is found, such that sub is contained within S[start:end].\n"
@@ -1916,4 +1916,4 @@ unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=9d243c63e951e31d input=a9049054013a1b77]*/
+/*[clinic end generated code: output=bee76c3a598ef563 input=a9049054013a1b77]*/
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3c689761de9b199..71e7137ff177ae9 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -11429,13 +11429,12 @@ PyUnicode_AppendAndDel(PyObject **pleft, PyObject *right)
 
 /*[clinic input]
 @permit_long_summary
-@text_signature "($self, sub[, start[, end]], /)"
 str.count as unicode_count -> Py_ssize_t
 
     self as str: self
     sub as substr: unicode
-    start: slice_index(accept={int, NoneType}, c_default='0') = None
-    end: slice_index(accept={int, NoneType}, c_default='PY_SSIZE_T_MAX') = None
+    start: slice_index(accept={int, NoneType}, c_default='0') = 0
+    end: slice_index(accept={int, NoneType}, c_default='PY_SSIZE_T_MAX') = sys.maxsize
     /
 
 Return the number of non-overlapping occurrences of substring sub in string S[start:end].
@@ -11447,7 +11446,7 @@ notation.
 static Py_ssize_t
 unicode_count_impl(PyObject *str, PyObject *substr, Py_ssize_t start,
                    Py_ssize_t end)
-/*[clinic end generated code: output=8fcc3aef0b18edbf input=c9209e05438cc352]*/
+/*[clinic end generated code: output=8fcc3aef0b18edbf input=66a5213425fc7a42]*/
 {
     assert(PyUnicode_Check(str));
     assert(PyUnicode_Check(substr));