diff --git a/_data/documentation.yml b/_data/documentation.yml
index e531391..834a54f 100755
--- a/_data/documentation.yml
+++ b/_data/documentation.yml
@@ -42,6 +42,8 @@
           url: http://doxygen.gem5.org/release/v21-0-0-0/index.html
         - page: v21.0.1.0
           url: http://doxygen.gem5.org/release/v21-0-1-0/index.html
+        - page: v21.1.0.0
+          url: http://doxygen.gem5.org/release/v21-1-0-0/index.html
 
     - title: gem5 Resources
       id: gem5_resources