Public Service Announcement: For Tag Wiki Excerpt suggested edits, there's a reject reason that states: "Tag excerpts amounting to, '[tag] is for questions about [tag]' are pointless and usually rejected. Excerpts should describe why and when a tag would be used." If a tag's scope is really that self evident then it just doesn't need an excerpt.

For Tag Wiki suggested edits, which don't get shown to everyone adding the tag, the allowance is more broad and even a bare wikipedia link to a common topic is better than nothing.