diff --git a/h5bp/directive-only/spdy.conf b/h5bp/directive-only/spdy.conf
index b98e243..f65912b 100644
--- a/h5bp/directive-only/spdy.conf
+++ b/h5bp/directive-only/spdy.conf
@@ -1,4 +1,8 @@
-# Nginx's spdy module is currently experimental
+# Nginx's spdy module is compiled by default from 1.6
+# SPDY only works on HTTPS connections
+
+# Inform browser of SPDY availability 
+add_header Alternate-Protocol  443:npn-spdy/3;
 
 # Adjust connection keepalive for SPDY clients:
 spdy_keepalive_timeout 300; # up from 180 secs default