diff --git a/msg/position_setpoint.msg b/msg/position_setpoint.msg
index 50163bae56..93c57fd5d2 100644
--- a/msg/position_setpoint.msg
+++ b/msg/position_setpoint.msg
@@ -41,6 +41,6 @@ float32 acceptance_radius   # navigation acceptance_radius if we're doing waypoi
 
 float32 cruising_speed		# the generally desired cruising speed (not a hard constraint)
 bool gliding_enabled		# commands the vehicle to glide if the capability is available (fixed wing only)
-float32 cruising_throttle	# the generally desired cruising throttle (not a hard constraint)
+float32 cruising_throttle	# the generally desired cruising throttle (not a hard constraint), only has an effect for rover
 
 bool disable_weather_vane   # VTOL: disable (in auto mode) the weather vane feature that turns the nose into the wind