More source links
diff --git a/Doc/library/telnetlib.rst b/Doc/library/telnetlib.rst
index 6e3abde..646634d 100644
--- a/Doc/library/telnetlib.rst
+++ b/Doc/library/telnetlib.rst
@@ -8,6 +8,10 @@
.. index:: single: protocol; Telnet
+**Source code:** :source:`Lib/telnetlib.py`
+
+--------------
+
The :mod:`telnetlib` module provides a :class:`Telnet` class that implements the
Telnet protocol. See :rfc:`854` for details about the protocol. In addition, it
provides symbolic constants for the protocol characters (see below), and for the