Asciidoctor is a publishing system that processes source files written in the AsciiDoc minimal markup format to produce output in HTML5, DocBook, PDF, and a number of other formats. According to the pull-quote on the Asciidoctor front page from Linux creator Linus Torvalds, AsciiDoc is a good format to use because "it's actually readable by humans, easier to parse and way more flexible than XML." The "Get Writing" link at the top right of the Asciidoctor home page will lead users to a guide documenting the AsciiDoc format along with a brief tutorial on how to produce HTML 5 and DocBook output. In the Docs section of the site, users can find more detailed reference manuals both on the AsciiDoc syntax and on advanced uses of the Asciidoctor toolchain. Under the Installation heading on the front page, users can locate instructions for installing Asciidoctor on Windows, macOS, and several flavors of Linux.