diff --git a/msg/RobotTrajectory.msg b/msg/RobotTrajectory.msg
index 94e883a..073128b 100644
--- a/msg/RobotTrajectory.msg
+++ b/msg/RobotTrajectory.msg
@@ -1,2 +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
+string group_name
\ No newline at end of file