Seonghyuck contributed to the hoodong/2025-2-PLC repository by enhancing project documentation, focusing on improving contributor visibility and onboarding processes. During September 2025, Seonghyuck updated the 6조.md file using Markdown, adding a comprehensive contributor list and an author note to clarify project authorship and governance. This work required careful attention to documentation structure and clarity, ensuring that new contributors could easily understand project roles and history. No code changes were introduced, maintaining repository stability while increasing transparency. The effort demonstrated proficiency in documentation best practices and Markdown, with the depth of work centered on informational clarity rather than technical complexity.