diff --git a/README.md b/README.md
index 37f4d18..e7cd0aa 100644
--- a/README.md
+++ b/README.md
@@ -101,13 +101,13 @@ To get the specific version of mavros_msgs for oscillation_ctrl:
 
 If this works, we can move on.
 
-### Add files to _tools/sitl_gazebo_
+### Add files to tools/sitl_gazebo
 copy (or add) files in _oscillation_ctrl/models_ and _oscillation_ctrl/worlds_ to _PX4-Autopilot/Tools/sitl_gazebo/models_ and _PX4-Autopilot/Tools/sitl_gazebo/worlds_ respectively
 
 	cp -R ~/catkin_ws/src/oscillation_ctrl/models/* ~/PX4-Autopilot/Tools/sitl_gazebo/models
 	cp -R ~/catkin_ws/src/oscillation_ctrl/worlds/* ~/PX4-Autopilot/Tools/sitl_gazebo/worlds
 
-### Add files to _ROMFS/px4mu_common
+### Add files to ROMFS/px4mu_common
 copy (or add) files in _oscillation_ctrl/airframes_ to _PX4-Autopilot/ROMFS/px4fmu_common/init.d-posix/airframes_
 
 	cp -R ~/catkin_ws/src/oscillation_ctrl/airframes/18.04/* ~/PX4-Autopilot/ROMFS/px4fmu_common/init.d-posix/airframes
@@ -212,6 +212,8 @@ __Subscribes to__:
 	/mavros/local_position/velocity_body
 	/mavros/imu/data
 
+### set_ploadmass.py
+sets the payload mass to be _pload_mass_ value in the _spiri_param.yaml_
 ### path_follow.cpp
 sets the vehicle in OFFBOARD mode (PX4) and takes off to a set height for 25 seconds before starting to publish attitude and thrust commands.