Nitish Rastogi enhanced the NHSDigital/e-referrals-service-api repository by improving the clarity and FHIR alignment of its API documentation. He focused on refining the OpenAPI Specification, using YAML to update endpoint descriptions, links, and array-type representations such as HealthcareService.type and Participant.type. Nitish introduced Known Issues sections to clarify discrepancies between the current API implementation and FHIR standards, reducing ambiguity for client integrators. His work emphasized maintainability and interoperability, ensuring the documentation accurately reflected the API’s behavior. By addressing array-type inconsistencies and refining wording, Nitish’s contributions made the API documentation more discoverable and easier to integrate for external developers.