Pol Serrano contributed to the IT-Academy-BCN/ita-challenges-backend repository by updating the Contributors.md file to recognize a new project participant, thereby improving the accuracy and transparency of project documentation. Working primarily with Markdown and focusing on documentation skills, Pol ensured that contributor records remained current, which supports smoother onboarding and clearer attribution within the open-source community. The update reinforced project governance and accountability without altering existing features or introducing new bugs. While the scope of work was limited to a single feature over one month, the contribution addressed the ongoing need for sustainable collaboration and effective documentation practices in the repository.