diff --git a/msg/vehicle_command.msg b/msg/vehicle_command.msg
index 9ddaad2a92..9403bc9ea9 100644
--- a/msg/vehicle_command.msg
+++ b/msg/vehicle_command.msg
@@ -155,6 +155,11 @@ uint8 FAILURE_TYPE_SLOW = 5
 uint8 FAILURE_TYPE_DELAYED = 6
 uint8 FAILURE_TYPE_INTERMITTENT = 7
 
+uint8 SPEED_TYPE_AIRSPEED = 0
+uint8 SPEED_TYPE_GROUNDSPEED = 1
+uint8 SPEED_TYPE_CLIMB_SPEED = 2
+uint8 SPEED_TYPE_DESCEND_SPEED = 3
+
 # used as param1 in ARM_DISARM command
 int8 ARMING_ACTION_DISARM = 0
 int8 ARMING_ACTION_ARM = 1