Mandar Joshi focused on enhancing documentation and code readability in the calcom/cal.diy repository during May 2026. He delivered a comprehensive cleanup that corrected typos and improved comments and setup instructions, aiming to make the codebase more maintainable and accessible for new contributors. Working primarily with JavaScript and TypeScript, Mandar applied his skills in code quality and documentation to standardize language and clarify inline notes. This targeted effort reduced the risk of misinterpretation and lowered support overhead, resulting in a cleaner, more navigable project. The work was anchored by a single, focused commit dedicated to documentation and readability improvements.