More source links.
diff --git a/Doc/library/tabnanny.rst b/Doc/library/tabnanny.rst
index 549ce36..4f3e705 100644
--- a/Doc/library/tabnanny.rst
+++ b/Doc/library/tabnanny.rst
@@ -9,6 +9,10 @@
 
 .. rudimentary documentation based on module comments
 
+**Source code:** :source:`Lib/tabnanny.py`
+
+--------------
+
 For the time being this module is intended to be called as a script. However it
 is possible to import it into an IDE and use the function :func:`check`
 described below.