diff --git a/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/Readme.md b/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/Readme.md
index 7f53b54bd9..214f68b1ea 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/Readme.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/Readme.md
@@ -12,7 +12,7 @@ The SpeedyBeeF405WING is a flight controller produced by [SpeedyBee](http://www.
     Power
         2S - 6S Lipo input voltage with voltage monitoring
         90A Cont., 215A peak current monitor
-        9V/12/5V, 1.8A BEC for powering Video Transmitter
+        9V/12/5V, 1.8A BEC for powering Video Transmitter controlled by GPIO
         4.9V/6V/7.2V, 4.5A BEC for servos
         5V, 2.4A BEC for internal and peripherals
     Interfaces
@@ -90,6 +90,10 @@ The correct battery setting parameters are set by default and are:
 
 The SpeedyBeeF405Wing does not have a built-in compass, but you can attach an external compass using I2C on the SDA and SCL pads.
 
+## VTX power control
+
+GPIO 81 controls the VTX BEC output to pins marked "9V". Setting this GPIO high removes voltage supply to pins.
+
 ## Loading Firmware
 Firmware for these boards can be found at https://firmware.ardupilot.org in sub-folders labeled “SpeedyBeeF405Wing”.
 
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/hwdef.dat
index 0c0604d55b..21b475d4ae 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/SpeedyBeeF405WING/hwdef.dat
@@ -166,6 +166,9 @@ define OSD_ENABLED 1
 define HAL_OSD_TYPE_DEFAULT 1
 ROMFS_WILDCARD libraries/AP_OSD/fonts/font0.bin
 
+#VTX power control
+PC13 PINIO1 OUTPUT GPIO(81) LOW
+
 define STM32_PWM_USE_ADVANCED TRUE
 
 # reduce max size of embedded params for apj_tool.py