diff --git a/pandas/core/strings.py b/pandas/core/strings.py
index 08a1cc29b8367..2eb2d284d8518 100644
--- a/pandas/core/strings.py
+++ b/pandas/core/strings.py
@@ -1322,19 +1322,75 @@ def str_slice(arr, start=None, stop=None, step=None):
 
 def str_slice_replace(arr, start=None, stop=None, repl=None):
     """
-    Replace a slice of each string in the Series/Index with another
-    string.
+    Replace a positional slice of a string with another value.
 
     Parameters
     ----------
-    start : int or None
-    stop : int or None
-    repl : str or None
-        String for replacement
+    start : int, optional
+        Left index position to use for the slice. If not specified (None),
+        the slice is unbounded on the left, i.e. slice from the start
+        of the string.
+    stop : int, optional
+        Right index position to use for the slice. If not specified (None),
+        the slice is unbounded on the right, i.e. slice until the
+        end of the string.
+    repl : str, optional
+        String for replacement. If not specified (None), the sliced region
+        is replaced with an empty string.
 
     Returns
     -------
-    replaced : Series/Index of objects
+    replaced : Series or Index
+        Same type as the original object.
+
+    See Also
+    --------
+    Series.str.slice : Just slicing without replacement.
+
+    Examples
+    --------
+    >>> s = pd.Series(['a', 'ab', 'abc', 'abdc', 'abcde'])
+    >>> s
+    0        a
+    1       ab
+    2      abc
+    3     abdc
+    4    abcde
+    dtype: object
+
+    Specify just `start`, meaning replace `start` until the end of the
+    string with `repl`.
+
+    >>> s.str.slice_replace(1, repl='X')
+    0    aX
+    1    aX
+    2    aX
+    3    aX
+    4    aX
+    dtype: object
+
+    Specify just `stop`, meaning the start of the string to `stop` is replaced
+    with `repl`, and the rest of the string is included.
+
+    >>> s.str.slice_replace(stop=2, repl='X')
+    0       X
+    1       X
+    2      Xc
+    3     Xdc
+    4    Xcde
+    dtype: object
+
+    Specify `start` and `stop`, meaning the slice from `start` to `stop` is
+    replaced with `repl`. Everything before or after `start` and `stop` is
+    included as is.
+
+    >>> s.str.slice_replace(start=1, stop=3, repl='X')
+    0      aX
+    1      aX
+    2      aX
+    3     aXc
+    4    aXde
+    dtype: object
     """
     if repl is None:
         repl = ''