Worked on the RWTH-EBC/AixLib repository to enhance code quality in Modelica models by focusing on documentation improvement and code refactoring. Addressed code comment readability in HeatRecoverySystem.mo and ExampleAHU.mo, correcting ambiguous typos to support maintainers and reduce misinterpretation. The changes were implemented through a single, traceable Git commit, ensuring transparency and ease of review. By refining inline documentation, the work improved maintainability and onboarding efficiency for future contributors. Utilized Modelica as the primary language and applied best practices in Git-based collaboration. The scope was targeted, addressing a specific documentation need rather than broader feature development or bug fixing.