In May 2025, Matthias Schlenker enhanced the Checkmk/checkmk-docs repository by updating and synchronizing multilingual documentation for German and English users. He focused on maintaining accurate feature lists, adding new entries such as 'notification_rules', and ensuring recent updates like 'robotmk' and 'monitoring_azure' were reflected across both language versions. Using asciidoc and text-based documentation skills, Matthias also addressed terminology inconsistencies and corrected typos in the German OpenTelemetry configuration, improving clarity for technical instructions. His work demonstrated careful attention to localization, version control, and technical writing, ultimately reducing onboarding time and minimizing the risk of misconfiguration for end users.