In January 2026, Hyeonjin Noh contributed to the langchain-ai/docs repository by correcting a documentation sample to accurately reflect the implemented trajectory evaluation API. Hyeonjin identified and fixed a mismatch in the sample code, updating the function name from 'judge_with_reference' to 'evaluator' to align with the actual Python interface. This targeted documentation update, written in Markdown and managed through Git, improved clarity for developers onboarding to the project and reduced the likelihood of user confusion or unnecessary support requests. The work demonstrated careful attention to technical writing and documentation quality, though the scope was limited to a single, focused bug fix.