diff --git a/msg/vehicle_constraints.msg b/msg/vehicle_constraints.msg
index 4849ac62bc..14bb4b627a 100644
--- a/msg/vehicle_constraints.msg
+++ b/msg/vehicle_constraints.msg
@@ -6,3 +6,5 @@ float32 speed_xy	# in meters/sec
 float32 speed_up	# in meters/sec
 float32 speed_down	# in meters/sec
 float32 tilt    # in radians [0, PI]
+
+bool landing_gear_up # true when up, false when down