diff --git a/readme.md b/readme.md
index d468c21..34db061 100644
--- a/readme.md
+++ b/readme.md
@@ -75,4 +75,6 @@ WebSecurityConfigurerAdapter
 - HttpSecurity http setting
 
 
-Authorization Server
\ No newline at end of file
+Authorization Server
+
+https://github.com/gilbutITbook/006962/blob/master/spmia-chapter7/zuulsvr/src/main/java/com/thoughtmechanix/zuulsvr/filters/AuthenticationFilter.java
\ No newline at end of file