Chunfei Yang contributed targeted improvements to the haskell/cabal repository by refining the REPL command help experience. Focusing on code formatting and documentation, Chunfei removed outdated references to sandbox usage from the replCommand help text and corrected whitespace formatting in the help output. These changes ensure that the help documentation accurately reflects current REPL behavior, reducing confusion for new and existing users. By updating the changelog to document these modifications, Chunfei demonstrated attention to documentation hygiene and incremental, low-risk code maintenance. The work, implemented in Haskell, lays a foundation for easier future updates and improved developer onboarding within the project.