diff --git a/README.md b/README.md
index 07a84e6..87bbe42 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ source ~/.bashrc
 ros2 launch slam_toolbox online_async_launch.py use_sim_time:=True
 ```
 ## 4.  启动Nav2导航栈
+```bash
 ros2 launch nav2_bringup navigation_launch.py use_sim_time:=True headless:=False
 ```
 ## 5.  打开rviz2