Katsuyuki Matsuyoshi enhanced the Complex Numbers Notebook in the tgstone/sio-math-workshop repository, focusing on improving instructional clarity and learner experience. Working primarily in Jupyter Notebook, he applied his skills in documentation, mathematics, and technical writing to reformat content, standardize equation presentation, and reorganize the appendix for consistent guidance. Through six iterative commits, he addressed formatting issues, removed unnecessary line breaks, and corrected typographical errors, resulting in a more readable and maintainable educational resource. The final version delivered a cohesive and accessible teaching tool, reflecting careful attention to detail and a methodical approach to quality and clarity in mathematical instruction.