One of the advantages of Kanban is to make your process visual and explicit. One part of it is to add your "Definition of done" at the bottom of every column. This is a short description of the conditions under which this step of the process can be considered complete. See an example here: http://technitai.wordpress.com/tag/game-design/

The idea would be to let board managers add a short check list of those steps that would be displayed at the bottom of each column.