diff --git a/msg/ManualControlSwitches.msg b/msg/ManualControlSwitches.msg
index 4d1cbab..39b6efe 100644
--- a/msg/ManualControlSwitches.msg
+++ b/msg/ManualControlSwitches.msg
@@ -29,6 +29,8 @@ uint8 transition_switch          # VTOL transition switch: _HOVER, FORWARD_FLIGH
 uint8 photo_switch               # Photo trigger switch
 uint8 video_switch               # Photo trigger switch
 
+uint8 payload_power_switch       # Payload power switch
+
 uint8 engage_main_motor_switch   # Engage the main motor (for helicopters)
 
 uint32 switch_changes            # number of switch changes
diff --git a/msg/RcChannels.msg b/msg/RcChannels.msg
index 546755f..b932dfd 100644
--- a/msg/RcChannels.msg
+++ b/msg/RcChannels.msg
@@ -28,13 +28,14 @@ uint8 FUNCTION_FLTBTN_SLOT_4 = 24
 uint8 FUNCTION_FLTBTN_SLOT_5 = 25
 uint8 FUNCTION_FLTBTN_SLOT_6 = 26
 uint8 FUNCTION_ENGAGE_MAIN_MOTOR = 27
+uint8 FUNCTION_PAYLOAD_POWER = 28
 
 uint8 FUNCTION_FLTBTN_SLOT_COUNT = 6
 
 uint64 timestamp_last_valid					# Timestamp of last valid RC signal
 float32[18] channels						# Scaled to -1..1 (throttle: 0..1)
 uint8 channel_count						# Number of valid channels
-int8[28] function						# Functions mapping
+int8[29] function						# Functions mapping
 uint8 rssi							# Receive signal strength index
 bool signal_lost						# Control signal lost, should be checked together with topic timeout
 uint32 frame_drop_count						# Number of dropped frames
diff --git a/msg/SystemPower.msg b/msg/SystemPower.msg
index 21b35ba..05754da 100644
--- a/msg/SystemPower.msg
+++ b/msg/SystemPower.msg
@@ -1,5 +1,6 @@
 uint64 timestamp		# time since system start (microseconds)
 float32 voltage5v_v		# peripheral 5V rail voltage
+float32 voltage_payload_v	# payload rail voltage
 float32[4] sensors3v3		# Sensors 3V3 rail voltage
 uint8 sensors3v3_valid		# Sensors 3V3 rail voltage was read (bitfield).
 uint8 usb_connected		# USB is connected when 1
@@ -10,6 +11,7 @@ uint8 periph_5v_oc		# peripheral overcurrent when 1
 uint8 hipower_5v_oc		# high power peripheral overcurrent when 1
 uint8 comp_5v_valid		# 5V to companion valid
 uint8 can1_gps1_5v_valid	# 5V for CAN1/GPS1 valid
+uint8 payload_v_valid		# payload rail voltage is valid
 
 uint8 BRICK1_VALID_SHIFTS=0
 uint8 BRICK1_VALID_MASK=1