Worked on the riscv/riscv-isa-manual repository to enhance documentation clarity by refining the terminology used for misa.X extensions. Focused on replacing the term 'present' with 'implemented' throughout the manual to better reflect the intended semantics of non-standard hardware extensions. This update, delivered in Markdown and leveraging technical writing skills, included explicit rationale to reduce ambiguity for readers, tool developers, and educators. The change improved the accuracy and consistency of the ISA manual, supporting more precise understanding and correct implementation decisions across the RISC-V ecosystem. No code changes or bug fixes were involved during this period, emphasizing documentation quality.