During their work on the OI-wiki/OI-wiki repository, this developer focused on improving the accuracy of mathematical documentation by correcting a reference error in the combinations formula section. Leveraging their skills in documentation and mathematics, they identified and resolved a bug that could have led to misinterpretation of core combinatorial principles. The fix, implemented using Markdown, ensured that the documentation accurately reflected the intended mathematical concepts and aligned with repository standards. Although the scope was limited to a single targeted correction, the work demonstrated careful attention to detail and contributed to the reliability and maintainability of the project’s documentation.