Contributed to the rust-lang/rust repository by enhancing the clarity of developer documentation, specifically focusing on the performance commentary for the HashMap data structure. Applied system programming expertise and strong documentation skills to identify and correct a grammatical error that could have led to misinterpretation during code reviews. The update, implemented in Rust, improved the precision of technical communication without altering any underlying code. This work aimed to streamline the onboarding process for new contributors and reduce friction during peer review, supporting long-term maintainability and readability of the codebase. No bugs were fixed, with all efforts directed toward documentation quality.