Add more links to Python sources where the code is short, readable and an informative adjunct to the docs.
diff --git a/Doc/library/cmd.rst b/Doc/library/cmd.rst
index cc49990..b35373c 100644
--- a/Doc/library/cmd.rst
+++ b/Doc/library/cmd.rst
@@ -12,6 +12,10 @@
 tools, and prototypes that will later be wrapped in a more sophisticated
 interface.
 
+.. seealso::
+
+   Latest version of the `cmd module Python source code
+   <http://svn.python.org/view/python/branches/release27-maint/Lib/cmd.py?view=markup>`_
 
 .. class:: Cmd([completekey[, stdin[, stdout]]])