how to discuss a wiki page before editing it?

What is the right way to post a comment / question about an unclear wiki page? I didn't see any way to start a discussion on the page itself; all I see is (edit, watch, history)

e.g. the Plugins page has some ambiguous language about migrating plugins, and before changing it I need to know what it is supposed to be saying.

Should one file a bug, or edit the page and put the comment in the page itself, or ...??