diff --git a/libraries/AP_InertialSensor/AP_InertialSensor_Flymaple.cpp b/libraries/AP_InertialSensor/AP_InertialSensor_Flymaple.cpp
index 8cd6bbca2d..c2c2276957 100644
--- a/libraries/AP_InertialSensor/AP_InertialSensor_Flymaple.cpp
+++ b/libraries/AP_InertialSensor/AP_InertialSensor_Flymaple.cpp
@@ -254,7 +254,7 @@ void AP_InertialSensor_Flymaple::_accumulate(void)
     // ADXL345 is in the default FIFO bypass mode, so the FIFO is not used
     uint8_t buffer[6];
     uint64_t now = hal.scheduler->micros();
-    // This takes about 500us at 200kHz I2C speed
+    // This takes about 250us at 400kHz I2C speed
     if ((now - _last_accel_timestamp) >= raw_sample_interval_us
         && hal.i2c->readRegisters(FLYMAPLE_ACCELEROMETER_ADDRESS, FLYMAPLE_ACCELEROMETER_ADXLREG_DATAX0, 6, buffer) == 0)
     {
@@ -274,7 +274,7 @@ void AP_InertialSensor_Flymaple::_accumulate(void)
 
     // Read gyro
     now = hal.scheduler->micros();
-    // This takes about 500us at 200kHz I2C speed
+    // This takes about 250us at 400kHz I2C speed
     if ((now - _last_gyro_timestamp) >= raw_sample_interval_us
         && hal.i2c->readRegisters(FLYMAPLE_GYRO_ADDRESS, FLYMAPLE_GYRO_GYROX_H, 6, buffer) == 0)
     {