diff --git a/msg/RobotTrajectory.msg b/msg/RobotTrajectory.msg
index 073128b..9be3afa 100644
--- a/msg/RobotTrajectory.msg
+++ b/msg/RobotTrajectory.msg
@@ -1,4 +1,4 @@
 trajectory_msgs/JointTrajectory joint_trajectory
 trajectory_msgs/MultiDOFJointTrajectory multi_dof_joint_trajectory
-# The name of the group of joints on which this trajectory is operating
+# The name of the planning group (= group of joints) which this trajectory actuates
 string group_name
\ No newline at end of file