# directoryURLs The directories managed by this extension. ``` var directoryURLs: Set! { get set } ``` ## Discussion The extension receives [`beginObservingDirectory(at:)`](/documentation/FinderSync/FIFinderSyncProtocol/beginObservingDirectory(at:)) and [`endObservingDirectory(at:)`](/documentation/FinderSync/FIFinderSyncProtocol/endObservingDirectory(at:)) messages for every directory in this set and for all of their subdirectories. Always set `directoryURLs` when the extension starts. If there are no directories to watch, set `directoryURLs` to an empty set. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)