diff --git a/dsdl/uavcan/equipment/air_data/280.Airspeed.uavcan b/dsdl/uavcan/equipment/air_data/280.Airspeed.uavcan
index ee366fcb55..46306b28ff 100644
--- a/dsdl/uavcan/equipment/air_data/280.Airspeed.uavcan
+++ b/dsdl/uavcan/equipment/air_data/280.Airspeed.uavcan
@@ -1,6 +1,10 @@
 #
-# True airspeed in meters per second.
+# IAS and TAS in meters per second.
+# Unknown values should be assigned NAN.
 #
 
+float16 indicated_airspeed
+float16 indicated_airspeed_variance
+
 float16 true_airspeed
 float16 true_airspeed_variance