Worked on enhancing the Operational API documentation within the RuterNo/adt-doc repository, focusing on improving clarity and integration for downstream developers. Delivered a feature enabling vehicle-based filtering through the addition of a vehicleId parameter, and expanded sign-on configuration details to include segmentCode, vehicle properties, operator and authority IDs, and an optional segmentCount. Refined the ServiceDeviation specification by removing the id field to streamline disruption modeling. All updates were consolidated in Markdown, leveraging strong API documentation and technical writing skills. The work aimed to reduce ambiguity, support resilience planning, and facilitate smoother onboarding for teams integrating with the Operational API.