diff --git a/autoware_planning_msgs/msg/TrajectoryPoint.msg b/autoware_planning_msgs/msg/TrajectoryPoint.msg
index 613ae4c..572e48a 100644
--- a/autoware_planning_msgs/msg/TrajectoryPoint.msg
+++ b/autoware_planning_msgs/msg/TrajectoryPoint.msg
@@ -2,6 +2,7 @@ builtin_interfaces/Duration time_from_start
 geometry_msgs/Pose pose
 float32 longitudinal_velocity_mps
 float32 lateral_velocity_mps
+# acceleration_mps2 increases/decreases based on absolute vehicle motion and does not consider vehicle direction (forward/backward)
 float32 acceleration_mps2
 float32 heading_rate_rps
 float32 front_wheel_angle_rad