diff -r 2072deff3b2f Doc/library/smtplib.rst
--- a/Doc/library/smtplib.rst	Mon Feb 24 14:31:25 2014 -0800
+++ b/Doc/library/smtplib.rst	Wed Mar 05 01:20:40 2014 +0530
@@ -297,7 +297,8 @@
 
    Put the SMTP connection in TLS (Transport Layer Security) mode.  All SMTP
    commands that follow will be encrypted.  You should then call :meth:`ehlo`
-   again.
+   again. If server supports TLS but fails to start it, then it does not raise
+   any exception.
 
    If *keyfile* and *certfile* are provided, these are passed to the :mod:`socket`
    module's :func:`ssl` function.