Peter Marshall focused on improving documentation quality and user experience in the apache/druid repository over a two-month period. He addressed two documentation bugs, first correcting an incorrect DimensionsSpec link in Partitioning.md to ensure accurate navigation for users configuring data partitioning. Later, he restored the GROUP BY metrics table header in metrics.md, resolving a Markdown rendering issue that had obscured metric information. Peter’s work relied on Markdown and Git, emphasizing precise, low-risk changes with clear traceability. His contributions enhanced documentation reliability and clarity, reducing user confusion and support needs, and demonstrated careful attention to detail in technical writing and documentation workflows.