Worked on the JetBrains/kotlin-web-site repository to improve the accuracy of Kotlin exercise documentation, specifically focusing on the delegation example. Addressed a documentation bug by updating the reference from BasicMessenger to the Messenger interface, ensuring the instructional material accurately reflected the underlying codebase. This change, implemented using Markdown and leveraging strong documentation skills, clarified the delegation concept for learners and reduced potential confusion during onboarding. No code changes were required beyond the documentation itself, but the update streamlined the learning process and minimized future support needs by aligning the exercise guide with the actual Kotlin implementation and project structure.