Worked on improving documentation accuracy and clarity across the rust-lang/rust and rust-lang/rustc-dev-guide repositories, focusing on the technical relationships between TyDecoder, TyEncoder, Decoder, and Encoder traits. Used Markdown and technical writing skills to clarify that TyDecoder and TyEncoder are subtraits, correcting terminology and fixing typos to ensure consistency between core documentation and the developer guide. This work addressed contributor confusion and streamlined onboarding by aligning language and definitions across repositories. The changes enhanced traceability at the commit level, supporting downstream maintenance and reducing misinterpretation in compiler development workflows for both new and existing contributors.