Jannes enhanced developer-facing documentation in the Yoast/developer repository, focusing on the roles and capabilities system within Yoast SEO. Over the course of a month, Jannes consolidated and expanded guidance on default role permissions such as wpseo_editor and wpseo_manager, and clarified how custom capabilities are assigned to roles. The work involved technical writing and documentation skills, using Markdown to ensure clarity and consistency. By addressing a grammatical issue and maintaining a clear commit history, Jannes improved the onboarding experience for developers and supported secure permission management. The depth of the update provided more comprehensive and accessible documentation for the project.