diff --git a/ROMFS/px4fmu_common/init.d/rc.sensors b/ROMFS/px4fmu_common/init.d/rc.sensors
index 1e14930fe3..be54ea98b0 100644
--- a/ROMFS/px4fmu_common/init.d/rc.sensors
+++ b/ROMFS/px4fmu_common/init.d/rc.sensors
@@ -24,6 +24,7 @@ fi
 
 if ver hwcmp PX4FMU_V2
 then
+	# IMPORTANT: EXTERNAL BUSES SHOULD BE SCANNED FIRST
 	if lsm303d start
 	then
 		echo "[init] Using LSM303D"