diff --git a/msg/TecsStatus.msg b/msg/TecsStatus.msg
index e823af4..ae6835d 100644
--- a/msg/TecsStatus.msg
+++ b/msg/TecsStatus.msg
@@ -26,7 +26,4 @@ float32 throttle_sp			# Current throttle setpoint [-]
 float32 pitch_sp_rad			# Current pitch setpoint [rad]
 float32 throttle_trim			# estimated throttle value [0,1] required to fly level at equivalent_airspeed_sp in the current atmospheric conditions
 
-# TECS mode
-uint8 mode
-uint8 TECS_MODE_NORMAL = 0
-uint8 TECS_MODE_UNDERSPEED = 1
+float32 underspeed_ratio		# 0: no underspeed, 1: maximal underspeed. Controller takes measures to avoid stall proportional to ratio if >0.