Yuriy Velichko contributed a documentation update to the prebid/prebid-server-java repository, focusing on clarifying build environment prerequisites for developers. He revised the README.md to specify Java SDK 21 as the required version, ensuring that all contributors align their local setups with the current project baseline. This change, implemented using Markdown and leveraging his documentation skills, aimed to reduce environment-related build errors and streamline onboarding for new team members. By standardizing the Java SDK requirement, Yuriy improved build reliability and minimized ambiguity during setup. The work addressed a targeted need, offering depth in documentation rather than breadth across multiple features.