diff --git a/msg/ModeCompleted.msg b/msg/ModeCompleted.msg
index 98f331ed64..bacff4a94b 100644
--- a/msg/ModeCompleted.msg
+++ b/msg/ModeCompleted.msg
@@ -1,4 +1,5 @@
 # Mode completion result, published by an active mode.
+# The possible values of nav_state are defined in the VehicleStatus msg.
 # Note that this is not always published (e.g. when a user switches modes or on
 # failsafe activation)
 uint64 timestamp				 # time since system start (microseconds)
@@ -10,5 +11,5 @@ uint8 RESULT_FAILURE_OTHER = 100 # Mode failed (generic error)
 
 uint8 result                     # One of RESULT_*
 
-uint8 nav_state                  # Source mode
+uint8 nav_state                  # Source mode (values in VehicleStatus)