diff --git a/README.md b/README.md
index f53d7b54cd9f8d9431eb6a67ede9fb31391ff763..de221bd1054ef1513eec2a5fa170bdaf1af9d0eb 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,6 @@ catkin_make_isolated
 source /usr/lib64/ros/setup.bash
 source ~/catkin_ws/devel_isolated/setup.bash
 
-
-ROS_MASTER_URI=http://130.235.83.121:11311 roslaunch ros_jr3_comedi publish.launch
+export ROS_MASTER_URI=http://130.235.83.121:11311
+roslaunch ros_jr3_comedi publish.launch
 ```