Worked on the ddbj/www repository to enhance documentation by enforcing HTTPS for genome sequence URLs, focusing on improving data security and compliance with modern web standards. The update involved systematically replacing HTTP with HTTPS in Markdown files, reducing the risk of man-in-the-middle attacks and aligning documentation with current TLS best practices. This documentation-only change required careful attention to detail to ensure accuracy and traceability, while minimizing deployment risk since no code was altered. Demonstrated skills in documentation and web standards, contributing a targeted feature that strengthened repository security posture and supported auditability through clear commit history and collaborative review processes.