diff --git a/_Sidebar.md b/_Sidebar.md
index 3d39632..2b2d7fc 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -36,6 +36,7 @@
       - [`getInput`](The-getInput-function)
       - [`returnError`](The-returnError-function)
       - [`returnClientError`](The-returnClientError-function)
+      - [`returnServerError`](The-returnServerError-function)
     - [FeedExpander](FeedExpander)
   - [Cache API](Cache-API)
     - [How to create a new Cache?](How-to-create-a-new-Cache)