Roy Spoolder focused on improving API documentation for the Software-Improvement-Group/sigridci repository, addressing a subtle but important issue in query string formatting. He identified that the documentation incorrectly used an ampersand to start the first query parameter, which could lead to confusion or misuse by API consumers. By updating the Markdown-based documentation to reflect the correct use of a question mark for the initial parameter, Roy aligned the docs with standard URL conventions. This documentation-focused work, leveraging his skills in Markdown and technical writing, enhanced clarity for developers and supported smoother onboarding, though it did not involve direct code changes.