diff --git a/README.md b/README.md
index a3a136b..5f1767b 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,9 @@
 
 #### 使用说明
 
-1.  xxxx
+在最外层目录 catkin_make
+可能需要 source ./devel/setup.bash
+1.  roslaunch librviz_tutorial laser.launch 
 2.  xxxx
 3.  xxxx