diff --git a/_Sidebar.md b/_Sidebar.md
index 9c1a8de..4ada3e5 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -19,6 +19,7 @@
 # [For developers](For-developers)
   - [Coding style policy](Coding-style-policy)
     - [Indentation](Indentation)
+    - [String concatenation](String-concatenation)
   - [Pull request policy](Pull-request-policy)
   - [Folder structure](Folder-structure)
   - [Actions](Actions)