diff --git a/docs/navigation-structure.md b/docs/navigation-structure.md
index c23906b..bb601d4 100644
--- a/docs/navigation-structure.md
+++ b/docs/navigation-structure.md
@@ -7,11 +7,14 @@ nav_order: 5
 # Navigation Structure
 {: .no_toc }
 
-## Table of contents
-{: .no_toc .text-delta }
-
+<details open markdown="block">
+  <summary>
+    Table of contents
+  </summary>
+  {: .text-delta }
 1. TOC
 {:toc}
+</details>
 
 ---