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# NSUbiquitousKeyValueStoreChangedKeysKey

A key that indicates which keys changed in the iCloud key-value store.

```
let NSUbiquitousKeyValueStoreChangedKeysKey: String
```

## Discussion

When the iCloud key-value store changes due to an external source, the system generates
a [`didChangeExternallyNotification`](/documentation/Foundation/NSUbiquitousKeyValueStore/didChangeExternallyNotification) notification. That notification can include this key.
The value of this key is an array of strings, each of which contains the name of a key that changed.

---

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