During December 2025, Armstrong focused on improving documentation hygiene and cross-repository consistency for the Buck2 and Buck2 Prelude projects. Working primarily in Python, he addressed documentation bugs by correcting typos in the srcs_filegroup_arg function comments, ensuring that references and paths remained consistent across both repositories. His approach emphasized code review and careful documentation updates without introducing any API or performance changes, thereby reducing onboarding friction and potential developer confusion. Armstrong collaborated with reviewers to maintain high code quality, demonstrating attention to detail and a methodical approach to documentation maintenance within large-scale build systems and developer tooling environments.