Contributed to the astropy/astropy repository by enhancing the documentation for the CIRS class, focusing on clarity and technical depth. Developed a comprehensive Python docstring that explains the CIRS frame’s physical meaning, its relationship to CIP, CIO, and ERA, and details the ERFA-based implementation. This work improved both developer and user understanding of the class, reducing support needs and facilitating onboarding for new contributors. The approach emphasized maintainability and standardization of celestial frame documentation, leveraging expertise in Python, astronomy, and technical writing. The contribution laid a foundation for future improvements in documentation quality across the astropy codebase without introducing new features or bug fixes.