diff --git a/Doc/library/dummy_threading.rst b/Doc/library/dummy_threading.rst
index 0658df2..b578324 100644
--- a/Doc/library/dummy_threading.rst
+++ b/Doc/library/dummy_threading.rst
@@ -4,6 +4,9 @@
 .. module:: dummy_threading
    :synopsis: Drop-in replacement for the threading module.
 
+**Source code:** :source:`Lib/dummy_threading.py`
+
+--------------
 
 This module provides a duplicate interface to the :mod:`threading` module.  It
 is meant to be imported when the :mod:`_thread` module is not provided on a