diff --git a/ReadMe.md b/ReadMe.md
index ba632c18..398beca9 100755
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -50,7 +50,7 @@ For simplified Chinese version: [简体中文版](./ReadMe_cn.md)
     ```bash
     $ cd ~/dev_ws/src
     # DO NOT omit "--recursive"，or the source code of dependent submodule will not be downloaded.
-    $ git clone https://github.com/xArm-Developer/xarm_ros2.git --recursive
+    $ git clone https://github.com/xArm-Developer/xarm_ros2.git --recursive -b $ROS_DISTRO
     ```
 
 - ### 4.3 Update "xarm_ros2" repository