In January 2025, Andrew Julian enhanced the HL7/fhir repository by refining FHIR Messaging documentation to clarify resource inclusion rules and the role of MessageHeader. He focused on aligning the documentation with FHIR interoperability standards, specifying that OperationDefinition and EventDefinition can define transmitted resources, and that MessageHeader is not used for interpreting resources after removal from a Bundle. Using HTML and leveraging his expertise in FHIR Standards and technical documentation, Andrew removed redundant explanations and improved guidance on Bundle inclusions. His work increased documentation accuracy, improved maintainability, and supported developer onboarding by mapping changes to relevant FHIR JIRA issues and commits.