Documentation is an essential component of Open Source Hardware (OSH) projects both for co-development and replication of designs. However, creating documentation and keeping it up-to-date is often challenging and time-intensive. In this presentation we present OSH Automated Documentation, a system that relates the CAD design semantically to a textual specification from which we generate assembly instructions semi-automatically. Our system makes use of a FreeCAD workbench and a compiler that closely interact to create high-quality Ikea-style assembly instructions.