Berta Maler enhanced the python/mypy repository by updating documentation to clarify the correct use of the Self type with Python metaclasses. She focused on reducing ambiguity in code examples and aligning guidance with Python’s type hinting standards and relevant PEPs. Using her expertise in Python, type hinting, and reStructuredText, Berta revised the metaclass documentation to address common misapplications, adding a Gotchas note to guide users on proper usage. Her targeted documentation fix improved onboarding and helped prevent errors in user code. The work demonstrated a thoughtful approach to technical writing, emphasizing accuracy and alignment with established Python typing practices.