diff --git a/pep-0511.txt b/pep-0511.txt
index 4a0766139..860d649b2 100644
--- a/pep-0511.txt
+++ b/pep-0511.txt
@@ -541,6 +541,9 @@ Python 3.5 for example.
 Discussion
 ==========
 
+* `[Python-ideas] PEP 511: API for code transformers
+  <https://mail.python.org/pipermail/python-ideas/2016-January/037884.html>`_
+  (January 2016)
 * `[Python-Dev] AST optimizer implemented in Python
   <https://mail.python.org/pipermail/python-dev/2012-August/121286.html>`_
   (August 2012)