diff --git a/libraries/AP_InertialSensor/AP_InertialSensor.cpp b/libraries/AP_InertialSensor/AP_InertialSensor.cpp
index 8fda29bb36..17ed0eabf2 100644
--- a/libraries/AP_InertialSensor/AP_InertialSensor.cpp
+++ b/libraries/AP_InertialSensor/AP_InertialSensor.cpp
@@ -741,7 +741,7 @@ AP_InertialSensor::detect_backends(void)
                                                       ROTATION_ROLL_180_YAW_90,
                                                       ROTATION_ROLL_180_YAW_90));
         ADD_BACKEND(AP_InertialSensor_Invensense::probe(*this, hal.spi->get_device(HAL_INS_MPU9250_NAME), ROTATION_YAW_270));
-        // new cubes have ICM20602, ICM2648, ICM20649
+        // new cubes have ICM20602, ICM20648, ICM20649
         ADD_BACKEND(AP_InertialSensor_Invensense::probe(*this, hal.spi->get_device("icm20602_ext"), ROTATION_ROLL_180_YAW_270));
         ADD_BACKEND(AP_InertialSensor_Invensensev2::probe(*this, hal.spi->get_device("icm20948_ext"), ROTATION_ROLL_180_YAW_270));
         ADD_BACKEND(AP_InertialSensor_Invensensev2::probe(*this, hal.spi->get_device("icm20948"), ROTATION_ROLL_180_YAW_270));