Keep track of Node revision in Workflow stage

Workflow only keep track of current node revision in the arbitrary workflow stage(s), what do I have to do if I want workflow to keep track of the node revision? For example, I create 3 stages as follow draft, review, publish. I have a Node which have 3 revisions. The first revision is in draft stage, and second revision in review stage, and third revision is in publish stage.

I note that the workflow_node table keep track of the node ID. If I want to keep track of the revision, I would add a version ID fields associate with the revisions table. What functions do I need to pay attention to when I do that.

Your comments and helps are greatly appreciated!