Worked on the aws/aws-cli repository, focusing on improving the accuracy and clarity of user-facing command line documentation. Addressed a bug in the EMR CLI help text by correcting a parameter name, ensuring that --repo-upgrade-on-boot is properly described for disabling package repository upgrades on boot. Applied Python and command line interface development skills to deliver a precise fix with minimal code changes, prioritizing documentation accuracy and user experience. Maintained high standards for code quality and QA hygiene, reducing potential user confusion and support issues. The work emphasized careful attention to detail in both documentation and Python-based CLI tooling.