Changcheng Liu focused on enhancing documentation quality for the amzn/rdma-core repository, targeting API access flags and MLX5 API surfaces. Over two months, he improved the clarity and structure of man pages and Markdown documentation, specifically correcting flag naming inconsistencies and refining technical explanations. Working primarily in C and Markdown, Changcheng aligned documentation with code changes, such as updating the IBV_ACCESS_OPTIONAL_RANGE flag and clarifying memory signature domains. His work did not alter the API itself but addressed developer onboarding and reduced support needs by making technical references more accurate and readable, demonstrating depth in documentation and attention to integration details.