diff --git a/_Sidebar.md b/_Sidebar.md
index 5a89e33..b7bf186 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -34,6 +34,7 @@
       - [`getIcon`](The-getIcon-function)  
         **Helper functions**  
       - [`getInput`](The-getInput-function)
+      - [`returnError`](The-returnError-function)
     - [FeedExpander](FeedExpander)
   - [Cache API](Cache-API)
     - [How to create a new Cache?](How-to-create-a-new-Cache)