diff --git a/libraries/AP_HAL_ChibiOS/hwdef/CUAVv5/README.md b/libraries/AP_HAL_ChibiOS/hwdef/CUAVv5/README.md
index af6b76e479..80ffe0b353 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/CUAVv5/README.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/CUAVv5/README.md
@@ -12,7 +12,7 @@ The full schematics of the board are available here:
  - Three IMUs: ICM20689, MPU6000 and BMI055
  - internal vibration isolation for IMUs
  - MS5611 SPI barometer
- - builtin SPI IST8310 magnetometer
+ - builtin I2C IST8310 magnetometer
  - microSD card slot
  - 6 UARTs plus USB
  - 14 PWM outputs
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/PH4-mini/README.md b/libraries/AP_HAL_ChibiOS/hwdef/PH4-mini/README.md
index f462e18b8d..516f832666 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/PH4-mini/README.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/PH4-mini/README.md
@@ -7,7 +7,7 @@ The Pixhawk4-Mini flight controller is sold by [Holybro](http://www.holybro.com/
  - STM32F765 microcontroller
  - Two IMUs: ICM20689 and BMI055
  - MS5611 SPI barometer
- - builtin SPI IST8310 magnetometer
+ - builtin I2C IST8310 magnetometer
  - microSD card slot
  - 5 UARTs plus USB
  - 8 PWM outputs
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk4/README.md b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk4/README.md
index 514601423c..4f5a2eb5d4 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk4/README.md
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk4/README.md
@@ -7,7 +7,7 @@ The Pixhawk4 flight controller is sold by [Holybro](http://www.holybro.com/produ
  - STM32F765 microcontroller
  - Two IMUs: ICM20689 and BMI055
  - MS5611 SPI barometer
- - builtin SPI IST8310 magnetometer
+ - builtin I2C IST8310 magnetometer
  - microSD card slot
  - 6 UARTs plus USB
  - 14 PWM outputs