diff --git a/README.rst b/README.rst
index d953e4b..495a043 100644
--- a/README.rst
+++ b/README.rst
@@ -158,6 +158,12 @@ WebSocket sample::
     ws.connect("wss://echo.websocket.org")
 
 
+How to enable `SNI <http://en.wikipedia.org/wiki/Server_Name_Indication>`_?
+------------------
+
+SNI support is available for Python 2.7.9+ and 3.2+. It will be enabled automatically whenever possible.
+
+
 Sub Protocols.
 ----------------------------------------