diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
index c5a51f0a6b..e60a3cf26d 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv5/hwdef.dat
@@ -145,6 +145,16 @@ define AP_FEATURE_RTSCTS 1
 # enable SBUS_OUT on IOMCU (if you have an IOMCU)
 define AP_FEATURE_SBUS_OUT 1
 
+# PWM AUX channels
+PE14 TIM1_CH4 TIM1 PWM(1) GPIO(50)
+PA10 TIM1_CH3 TIM1 PWM(2) GPIO(51)
+PE11 TIM1_CH2 TIM1 PWM(3) GPIO(52)
+PE9  TIM1_CH1 TIM1 PWM(4) GPIO(53)
+PD13 TIM4_CH2 TIM4 PWM(5) GPIO(54)
+PD14 TIM4_CH3 TIM4 PWM(6) GPIO(55)
+#PH6  TIM12_CH1 TIM12 PWM(7) GPIO(56)
+#PH9  TIM12_CH2 TIM12 PWM(8) GPIO(57)
+
 SPIDEV ms5611         SPI4 DEVID1  MS5611_CS    MODE3 20*MHZ 20*MHZ
 SPIDEV icm20689       SPI1 DEVID1  ICM20689_CS  MODE0  1*MHZ  8*MHZ
 SPIDEV icm20602       SPI1 DEVID2  ICM20602_CS  MODE0  1*MHZ  8*MHZ