This document discusses writing effective service documentation for the EUDAT B2 suite of services. It provides an overview of the EUDAT B2 services and research data lifecycle context. It describes the approach to documentation writing, including identifying the end users and leveraging documentation from core technologies. The format and locations of documentation for services like B2ACCESS, B2DROP, B2FIND, B2HANDLE, B2SAFE, and B2SHARE are outlined, including code repositories, descriptions, usage guides, and training materials.