Preston contributed a documentation update to the letsencrypt/website repository, focusing on clarifying certificate issuance handling and DNS challenge processes. Using Markdown and leveraging strong documentation skills, Preston detailed how to avoid unintended certificate issuance when revoking from a different account and provided guidance on skipping validation steps for specific domains. This update addressed potential misconfiguration and security risks, improving user onboarding and support efficiency by reducing ambiguity in the issuance workflow. The work emphasized traceability by linking changes to a specific commit, supporting future maintenance and auditability. The contribution was targeted, addressing a nuanced aspect of certificate management documentation.