Worked on the levizh/rt-thread repository to enhance the maintainability and clarity of the POSIX signal function by delivering comprehensive documentation within posix_signal.c. Focused on C programming and technical writing, the approach involved detailing the function’s purpose, parameters, and return values without altering its runtime behavior. This documentation-driven update aimed to streamline onboarding for new contributors and facilitate cross-team understanding, laying a foundation for future feature development and code reviews. No bugs were addressed during this period, as the primary contribution centered on improving code quality and supporting collaborative development through clear, well-structured documentation in the C language.