How to make an option required?

While I might have missed it in the documentation, I saw nothing about how to make an option mandatory. Can Anyone point Me in the direction of such information?

Thanks in advance.

The issue names no file, test, or entry point. Review the repository's existing documentation and Go flag-option guidance to find where required options should be explained. Done means documenting how to make an option mandatory, with an example that answers the question.

Written by the indexing model from the issue text.