diff --git a/README.md b/README.md
index 0c177e9..dc260da 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ under scenarios requiring the [WS-Federation protocol](http://msdn.microsoft.
 for authentication. These services are typically used for Identity Federation and Single
 Sign-On across large organizations or authentication domains.
 
-* [Windows Azure ACS](http://msdn.microsoft.com/en-us/library/windowsazure/gg429786.aspx)
+* [Windows Azure ACS](https://msdn.microsoft.com/en-us/library/azure/gg429788.aspx)
 * [ADFS 2.0](http://msdn.microsoft.com/en-us/magazine/ee335705.aspx)
 * Corporate Secure Token Servers (STSs)