Provide links to Python source where the code is short, readable and
informative adjunct to the docs.  Forward-port of Raymond's r86225 and
r86245 using the new source reST role added in #10334.
diff --git a/Doc/library/fnmatch.rst b/Doc/library/fnmatch.rst
index 0352b52..8af6c0b 100644
--- a/Doc/library/fnmatch.rst
+++ b/Doc/library/fnmatch.rst
@@ -33,6 +33,10 @@
 a period are not special for this module, and are matched by the ``*`` and ``?``
 patterns.
 
+.. seealso::
+
+   Latest version of the :source:`fnmatch Python source code
+   <Lib/fnmatch.py>`
 
 .. function:: fnmatch(filename, pattern)