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/linecache.rst b/Doc/library/linecache.rst
index 688e297..d8a9ff3 100644
--- a/Doc/library/linecache.rst
+++ b/Doc/library/linecache.rst
@@ -11,6 +11,11 @@
 lines are read from a single file.  This is used by the :mod:`traceback` module
 to retrieve source lines for inclusion in  the formatted traceback.
 
+.. seealso::
+
+   Latest version of the :source:`linecache module Python source code
+   <Lib/linecache.py>`
+
 The :mod:`linecache` module defines the following functions: