During November 2024, this developer enhanced the internal documentation for the Write-Ahead Log (WAL) record format in the grafana/prometheus repository. Focusing on technical writing and documentation skills, they provided a detailed breakdown of the initial type byte, clarifying the roles of compression and type flags. Using Markdown, they aligned the new documentation with existing standards, ensuring consistency and accuracy. This work addressed onboarding challenges and reduced maintenance risks by making the WAL format easier to understand and evolve. The depth of the documentation supports faster iteration on storage changes and improves self-service for developers working with storage formats.