During January 2026, Tiago Monteiro contributed to the EbookFoundation/free-programming-books repository by expanding its Artificial Intelligence section. He added a new resource, "The Math Behind Artificial Intelligence," to enhance the breadth of foundational AI materials available to learners. Tiago focused on content management and documentation, utilizing Markdown to ensure consistency and clarity throughout the repository. His work aligned with the project’s goal of curating high-quality, freely accessible programming books. By adhering to open-source contribution guidelines and collaborating effectively with maintainers, Tiago demonstrated attention to detail and a commitment to maintaining the repository’s standards, though he did not address bug fixes.