Chaehyebin enhanced the hoodong/2025-2-PLC repository by expanding the Student Profile Self-Introduction in the 12조.md file to include each student’s major and year, addressing the need for clearer profile data and improved reader context. Using Markdown for documentation updates, Chaehyebin focused on single-source change entry and maintained strong commit hygiene, ensuring traceability with a precise, single-commit feature delivery. The update improved documentation consistency and readability, supporting smoother onboarding for new collaborators and more accurate representation of student details. The work demonstrated attention to detail in documentation and a methodical approach to repository maintenance, though it was limited in scope.