diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst
index 3771ab06f59..6b3a3b64915 100644
--- a/Doc/library/os.path.rst
+++ b/Doc/library/os.path.rst
@@ -242,7 +242,7 @@ the :mod:`glob` module.)
    links encountered in the path (if they are supported by the operating system).
 
 
-.. function:: relpath(path, start=None)
+.. function:: relpath(path, start=os.curdir)
 
    Return a relative filepath to *path* either from the current directory or
    from an optional *start* directory.  This is a path computation:  the