During January 2025, Miguel enhanced the EmilHvitfeldt/xgboost repository by improving the clarity of its documentation, specifically focusing on the regularization term notation. He standardized the summation index to 'k' throughout the model’s objective function documentation, ensuring mathematical consistency and reducing the risk of misinterpretation for users configuring regularization. This update, implemented in reStructuredText (rst) and managed through version control, aimed to streamline onboarding and support reproducibility for contributors and users alike. Miguel’s work demonstrated technical writing skills and attention to mathematical detail, though the scope was limited to a single documentation feature without direct code or bug fixes.