Kota Yatagai contributed to documentation quality and localization across open-source projects, focusing on clarity and maintainability. In the moq-wg/moq-transport repository, Kota addressed a documentation typo using Markdown, improving onboarding by reducing ambiguity for new contributors. Later, in the mdn/translated-content repository, Kota enhanced the Japanese translation of the Video codecs section, refining language for better user comprehension and aligning with localization standards. The work involved content writing, documentation, and collaboration with other contributors, ensuring updates met project guidelines. Kota’s contributions, though limited in scope, demonstrated careful attention to detail and supported long-term maintainability and accessibility for diverse developer audiences.