diff --git a/_Sidebar.md b/_Sidebar.md
index b7bf186..3d39632 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -35,6 +35,7 @@
         **Helper functions**  
       - [`getInput`](The-getInput-function)
       - [`returnError`](The-returnError-function)
+      - [`returnClientError`](The-returnClientError-function)
     - [FeedExpander](FeedExpander)
   - [Cache API](Cache-API)
     - [How to create a new Cache?](How-to-create-a-new-Cache)