diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
index a7e78bd..f4cac3a 100644
--- a/Doc/library/ssl.rst
+++ b/Doc/library/ssl.rst
@@ -237,6 +237,9 @@
 
    Selects SSL version 2 as the channel encryption protocol.
 
+   This protocol is not available if OpenSSL is compiled with OPENSSL_NO_SSL2
+   flag.
+
    .. warning::
 
       SSL version 2 is insecure.  Its use is highly discouraged.