diff --git a/README.md b/README.md
index 2929d8a..07cf649 100644
--- a/README.md
+++ b/README.md
@@ -126,10 +126,13 @@ Currently, this layer is still under continuous development.
 
   to the /etc/hosts file, and set up the environment with
 
-    export ROS_ROOT=/usr
+    export ROS_ROOT=/opt/ros/hydro
+    export PATH=$PATH:/opt/ros/hydro/bin
+    export LD_LIBRARY_PATH=/opt/ros/hydro/lib
+    export PYTHONPATH=/opt/ros/hydro/lib/python2.7/site-packages
     export ROS_MASTER_URI=http://localhost:11311
-    export CMAKE_PREFIX_PATH=/usr
-    touch /usr/.catkin
+    export CMAKE_PREFIX_PATH=/opt/ros/hydro
+    touch /opt/ros/hydro/.catkin
 
   Finally, you can start roscore with