Worked on enhancing internal documentation for the Write-Ahead Log (WAL) record format in the grafana/prometheus repository, focusing on providing a detailed breakdown of the initial type byte, including compression and type flags. This effort involved technical writing and documentation skills, using Markdown to ensure clarity and consistency with existing materials. The improved documentation reduces onboarding time for new developers and lowers maintenance risks when evolving the WAL format. By aligning the documentation with current implementation details and edge cases, the work supports maintainability and enables faster iteration on storage-related changes, ultimately strengthening the reliability of the storage subsystem.