More source links.
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst
index aeb792e..0cb170b 100644
--- a/Doc/library/concurrent.futures.rst
+++ b/Doc/library/concurrent.futures.rst
@@ -4,8 +4,13 @@
.. module:: concurrent.futures
:synopsis: Execute computations concurrently using threads or processes.
+**Source code:** :source:`Lib/concurrent/futures/thread.py`
+and :source:`Lib/concurrent/futures/process.py`
+
.. versionadded:: 3.2
+--------------
+
The :mod:`concurrent.futures` module provides a high-level interface for
asynchronously executing callables.