Marta Wrzochalska enhanced the eu-cdse/documentation repository by delivering two features focused on data catalog and instrument documentation. She updated the collections.json file using JSON to add a new 'os_images' collection and refine metadata for existing datasets, improving data discoverability and consistency. Marta also authored detailed Quarto Markdown documentation for Copernicus Sentinel-6 instruments, clarifying technical details for users and supporting onboarding. Her work emphasized metadata governance and documentation management, ensuring adherence to naming conventions and reproducibility standards. Throughout the month, she maintained a thorough commit history and applied Git-based workflows, contributing depth and clarity to the project’s documentation assets.