diff --git a/_Sidebar.md b/_Sidebar.md
index 6a66b60..1580511 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -1,3 +1,3 @@
-# Communication Protocol
+## Communication Protocol
 [Summary](https://github.com/Livox-SDK/Livox-SDK/wiki/Livox-SDK-Communication-Protocol#1-summary)<br/>
 [Control Command](https://github.com/Livox-SDK/Livox-SDK/wiki/Livox-SDK-Communication-Protocol#2-control-command)
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