diff --git a/Livox-SDK-Communication-Protocol.md b/Livox-SDK-Communication-Protocol.md
index 3667c88..0195761 100644
--- a/Livox-SDK-Communication-Protocol.md
+++ b/Livox-SDK-Communication-Protocol.md
@@ -1,6 +1,6 @@
 **Livox SDK Communication Protocol**
 
-| **Document Release History** |             |                                   |
+| **Document Release History**                                    |
 | ---------------------------- | ----------- | --------------------------------- |
 | **Date**                     | **Release** | **Change Description**            |
 | 2019/4/17                    | v1.0.3      | Update Hub read LiDAR extrinsic parameters description |