Aleksandr Karpinskii enhanced the moby/buildkit repository by delivering a targeted documentation update focused on the ARG instruction in Dockerfiles. Using Markdown and leveraging his expertise with Docker, he clarified the scope, defaults, and build-time impact of ARG, providing practical examples and detailed notes on cache behavior and layering. This work aimed to improve build reproducibility and streamline onboarding for new contributors, reducing the likelihood of misconfigurations and support queries. Although no bugs were addressed during this period, Aleksandr’s contribution demonstrated depth in documentation and knowledge transfer, ensuring that the repository’s guidance is both actionable and technically precise.