diff --git a/lib/oauth2/strategy/auth_code.ex b/lib/oauth2/strategy/auth_code.ex
index 3fe52ae..e4fe1f2 100644
--- a/lib/oauth2/strategy/auth_code.ex
+++ b/lib/oauth2/strategy/auth_code.ex
@@ -2,7 +2,7 @@ defmodule OAuth2.Strategy.AuthCode do
   @moduledoc """
   The Authorization Code Strategy.
 
-  http://tools.ietf.org/html/draft-ietf-oauth-v2-15#section-4.1
+  http://tools.ietf.org/html/rfc6749#section-1.3.1
   """
 
   use OAuth2.Strategy