diff --git a/README_CN.md b/README_CN.md
index e824a16..7d1be30 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -118,7 +118,7 @@ roslaunch livox_ros_driver livox_lidar_rviz.launch bd_list:="0TFDG3B006H2Z11&1HD
 float32 x               # X axis, unit:m
 float32 y               # Y axis, unit:m
 float32 z               # Z axis, unit:m
-float intensity         # the value is reflectivity, 0~255
+float32 intensity       # the value is reflectivity, 0~255
 uint8 tag               # livox tag
 uint8 line              # laser number in lidar