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# additionalContactKeyDescriptors

An array of contact property keys or key descriptors from contact objects to fetch in the returned contacts.

```
var additionalContactKeyDescriptors: [any CNKeyDescriptor]? { get set }
```

## Discussion

By default, the system only fetches [`CNContactIdentifierKey`](/documentation/Contacts/CNContactIdentifierKey) if you do not include a list of additional key descriptors. The system always fetches [`CNContactIdentifierKey`](/documentation/Contacts/CNContactIdentifierKey), whether you request it or not.

For a list of possible keys, see [Contact Keys](/documentation/Contacts/contact-keys).

---

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