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

# NSSystemExtensionUsageDescription

A message that tells people why the app is trying to install a system extension bundle.

## Discussion

Discussion This key is required for all system extensions except DriverKit extensions. Failure to include this key results in an error at activation time. For DriverKit extensions, use OSBundleUsageDescription instead.

## See Also

### System Extensions

- [OSBundleUsageDescription](bundleresources/information-property-list/osbundleusagedescription.md)