Chengyu Tang focused on maintaining and improving documentation quality for the eclipse-sumo/sumo repository during January 2025. Their primary contribution involved identifying and correcting a documentation bug related to the speedFactor attribute, where a misplaced parenthesis could have led to user confusion. Using Markdown and leveraging strong documentation skills, Chengyu ensured that the technical descriptions accurately reflected the intended meaning and aligned with repository standards. While no new features were developed during this period, their work contributed to clearer, more reliable documentation, supporting both user understanding and developer trust in the project’s technical resources. The depth of work was targeted and precise.