PlantUML is a great markup language for creating (not only) UML diagrams. Let’s try and make this tool work with Hugo + Asciidoc. Asciidoctor has an asciidoctor-diagram package in its toolset. This package should add support not only for PlantUML but also for GraphViz and other graphing markups. Cool. Asciidoctor-diagram was installed when setting up the platform, covered in the previous article If you try to add a simple PlantUML diagram now, you will probably get an empty picture.