I've considered the <u>[extension sources](https://sqlite.org/src/dir?ci=trunk&name=ext)</u> to be the documentation you find missing. The files there are generally commented to show purpose and usage. As for appearance in the main SQLite library documentation, I always figured the extensions are not part of the library and serve as examples of the extension API or tools for internal use. Maybe some expansion of the README.md files in the extension subdirectories would suffice for the purposes you envision. If there is silliness in your idea, I would only assign such to the implication that the library documentation **should** cover extensions.