diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index 2a7d6eb..95f5f70 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -231,6 +231,10 @@
 
    Selects SSL version 2 as the channel encryption protocol.
 
+   .. warning::
+
+      SSL version 2 is insecure.  Its use is highly discouraged.
+
 .. data:: PROTOCOL_SSLv23
 
    Selects SSL version 2 or 3 as the channel encryption protocol.  This is a