Worked on enhancing the documentation for the EmilHvitfeldt/xgboost repository, focusing on clarifying the mathematical notation used for the regularization term. The main contribution involved standardizing the summation index to 'k' throughout the documentation to ensure consistency with the model’s objective function, reducing potential confusion for users configuring regularization. This update, implemented in reStructuredText (rst), demonstrated skills in technical writing, mathematical notation, and version control. By improving clarity and alignment between documentation and code, the work aimed to streamline onboarding, support reproducibility, and facilitate troubleshooting for both users and contributors working with the xgboost library.