# addDebugMarker(_:range:) Adds a debug marker string to a specific buffer range. ``` func addDebugMarker(_ marker: String, range: Range) ``` ## Parameters `marker` A string that identifies the marked buffer range. `range` The range of bytes that you want to identify. --- 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)