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 project’s current baseline. This change, implemented using Markdown and leveraging his documentation skills, aimed to reduce ambiguity during onboarding and minimize environment-related build errors. By standardizing the Java SDK requirement, Yuriy improved build reliability and streamlined the onboarding process for new team members. The work addressed a targeted need with clear, practical guidance, reflecting a focused engineering contribution.