diff --git a/msg/input_rc.msg b/msg/input_rc.msg
index 3e226966e6..331551f951 100644
--- a/msg/input_rc.msg
+++ b/msg/input_rc.msg
@@ -6,6 +6,9 @@ uint8 RC_INPUT_SOURCE_PX4IO_SBUS = 4
 uint8 RC_INPUT_SOURCE_PX4IO_ST24 = 5
 uint8 RC_INPUT_SOURCE_MAVLINK = 6
 uint8 RC_INPUT_SOURCE_QURT = 7
+uint8 RC_INPUT_SOURCE_PX4FMU_SPEKTRUM = 8
+uint8 RC_INPUT_SOURCE_PX4FMU_SBUS = 9
+uint8 RC_INPUT_SOURCE_PX4FMU_ST24 = 10
 
 uint8 RC_INPUT_MAX_CHANNELS = 18 	# Maximum number of R/C input channels in the system. S.Bus has up to 18 channels.