Units of measurement are used everywhere where quantities are stored, albeit often only implicitly or even tacitly. Current topic maps are no exception. However, the nature of Topic Maps — to provide explicit disclosure in general — asks for explicit disclosure of the applicable unit of measurement of a given quantity in particular. The TMDM has no special support for units. This paper looks into how units can be used consistently within Topic Maps, and how a units topic map can be auto-generated using a Ruby DSL.