May 2026 monthly summary focusing on documentation-only improvements in the CPython codebase. Delivered a targeted documentation clarification for the IPv6Address.ipv4_mapped attribute in picnixz/cpython, aligning the guidance with RFC references and removing ambiguous language around the address range. Commit 7aedd0a6c6ae3b5cdd601e84411e41c56f8d00b9 (gh-87245) closes the related issue. No major bugs fixed this month; the emphasis was on clarifying behavior and improving developer/user understanding. Overall impact: reduced user confusion around IPv4-mapped addresses, improved onboarding for contributors, and strengthened RFC-aligned documentation that supports downstream adoption and support efficiency. Technologies/skills demonstrated: documentation best practices, RFC-based clarification, careful changelog/PR messaging, and adherence to CPython contribution standards.