Holger expanded the documentation for the chatmail/core repository, focusing on improving developer onboarding and clarifying system capabilities. He enhanced the README to provide detailed explanations of network protocols, encryption methods, and integration points with various applications, using Markdown to ensure clarity and accessibility. His technical writing demonstrated a strong understanding of documentation standards and security concepts, particularly in the context of encrypted communications. By outlining supported technologies and protocols, Holger enabled faster integrations and a clearer ecosystem overview. The work addressed the need for comprehensive, accessible documentation, contributing depth and structure to the project’s technical resources without introducing new code.