Jerry Cai enhanced the documentation for the JuiceFS S3 Gateway in the juicedata/juicefs repository, focusing on clarifying the behavior of the --keep-etag option. He provided detailed Markdown-based guidance and practical usage examples, demonstrating how to enable and retrieve ETags through S3 API calls and access them via extended attributes when xattrs are enabled. Additionally, Jerry addressed a formatting issue in the Chinese documentation to improve readability and consistency. His work centered on documentation and Markdown, aiming to improve operator experience and data integrity workflows by making ETag management clearer and more actionable for JuiceFS users.