diff --git a/pep-3151.txt b/pep-3151.txt
index c8e8061e9..fdb287a0c 100644
--- a/pep-3151.txt
+++ b/pep-3151.txt
@@ -495,7 +495,8 @@ Implementation
 ==============
 
 A reference implementation is available in
-http://hg.python.org/features/pep-3151/ in branch ``pep-3151``.
+http://hg.python.org/features/pep-3151/ in branch ``pep-3151``.  It is
+also tracked on the bug tracker at http://bugs.python.org/issue12555.
 Its current state is that all semantic changes and additions are implemented,
 but the `deprecation of names`_ mechanism isn't.  It has been successfully
 tested on a variety of systems: Linux, Windows, OpenIndiana and FreeBSD