---
title: NSMotionUsageDescription
framework: bundleresources
role: symbol
role_heading: Property List Key
path: bundleresources/information-property-list/nsmotionusagedescription
---

# NSMotionUsageDescription

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

## Discussion

Discussion important: This key is required if your app uses APIs that access the device’s motion data, including CMSensorRecorder, CMPedometer, CMMotionActivityManager, and CMMovementDisorderManager. If you don’t include this key, your app will crash when it attempts to access motion data.

## See Also

### Motion

- [NSFallDetectionUsageDescription](bundleresources/information-property-list/nsfalldetectionusagedescription.md)