diff --git a/mkdocs.yml b/mkdocs.yml
index 54a0fa50a67..511cefb5e67 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -27,6 +27,7 @@ nav:
       - utilities/idempotency.md
       - utilities/feature_flags.md
       - utilities/jmespath_functions.md
+      - CloudFormation Custom Resources: https://github.com/aws-cloudformation/custom-resource-helper" target="_blank
 
 theme:
   name: material