diff --git a/pep-0487.txt b/pep-0487.txt
index e360852cd..947f35c5f 100644
--- a/pep-0487.txt
+++ b/pep-0487.txt
@@ -303,6 +303,13 @@ replace the current ``type`` and ``object`` with the following::
             pass
 
 
+Reference Implementation
+========================
+
+The reference implementation for this PEP is attached to
+`issue 27366 <http://bugs.python.org/issue27366>`__.
+
+
 Backward compatibility issues
 =============================