This document presents an overview of the Diamond Discovery Hub (DDH) documentation, outlining the procedures for onboarding institutional publishers and journals. The documentation covers the platform’s mission, its target audiences, as well as the requirements for journal inclusion, including the diamond open access criteria and relevant metadata. It clarifies the roles and responsibilities within the DDH user management system and explains the procedures for becoming a trusted data source. Furthermore, the documentation offers instructions for different user groups, e.g. describing aspects of the journal verification and management for trusted data sources. The documentation deals with data submission, data reuse options, support channels, and covers privacy and accessibility guidelines. Implemented on WordPress as a subpage of the DDH, the documentation is designed as a practical tool for users engaging with the DDH. This deliverable is currently under review by the EC.