remark-lint-no-file-name-mixed-case is a remark-lint rule that enforces lowercase file names for Markdown documents. It helps maintain consistency and readability across projects by preventing mixed-case file names like MyFile.md or fileName.md. This promotes a cleaner directory structure and aligns with best practices for web development, where lowercase filenames are often preferred for web server compatibility. The rule improves collaboration and reduces potential issues caused by case-sensitive file systems.