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# NSMotionUsageDescription

A message that tells people why the app is requesting access to the device’s motion data.

## Discussion

> Important:
> This key is required if your app uses APIs that access the device’s motion data, including <doc://com.apple.documentation/documentation/CoreMotion/CMSensorRecorder>, <doc://com.apple.documentation/documentation/CoreMotion/CMPedometer>, <doc://com.apple.documentation/documentation/CoreMotion/CMMotionActivityManager>, and <doc://com.apple.documentation/documentation/CoreMotion/CMMovementDisorderManager>. If you don’t include this key, your app will crash when it attempts to access motion data.

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