diff --git a/msg/airspeed.msg b/msg/airspeed.msg
index 525bfd7f88..f0a109a7e7 100644
--- a/msg/airspeed.msg
+++ b/msg/airspeed.msg
@@ -3,3 +3,4 @@ float32 indicated_airspeed_m_s		# indicated airspeed in meters per second, -1 if
 float32 true_airspeed_m_s		# true filtered airspeed in meters per second, -1 if unknown
 float32 true_airspeed_unfiltered_m_s	# true airspeed in meters per second, -1 if unknown
 float32 air_temperature_celsius		# air temperature in degrees celsius, -1000 if unknown
+float32 confidence			# confidence value from 0 to 1 for this sensor