diff --git a/README.md b/README.md
index 18b6879..db07a76 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ The Group Docker image is based on Unicon's work, and relies on a seperate MySQL
 
 > This image does not follow best Docker practices. It is intended from demo/class usage. It can also be useful for use as a base image for Grouper development.
 
+This demo also includes a working version of using an attribute on a group to restrict release of group information via isMemberOf to only specific SPs. Original write-up: https://spaces.internet2.edu/display/Grouper/UW-Madison+Group+Membership+Delivery+to+Shibboleth 
+
 ## Building
 
 To build the demo: