Rolf Normann updated the Door API documentation in the RuterNo/adt-doc repository to align with ADT2.0 standards, ensuring endpoint descriptions accurately reflect recent changes without altering existing client behavior. He also addressed a data integrity issue by enforcing MessageNumber as a required field for Door-related endpoints, preventing inconsistencies in backend data processing. His work combined API development, backend development, and thorough documentation, utilizing Python and Markdown to deliver clear, maintainable updates. The changes improved developer onboarding and API reliability, demonstrating careful attention to both technical detail and user impact within a focused, high-quality engineering effort over the month.