early-modern has no wiki summary, and IMHO would definitely need one.
edit: or, if nobody know what it is supposed to mean, it could be removed of course.
If you have any ideas or suggestions as to what it should be, then please submit it. Frankly, I'm not sure what it was intended to represent!
Most of the questions I found would fit better with having the specific century being the time related tag used for those questions. I'd assume the purpose that this tag was created for was to give an era based tag? If so, probably one(s) that more reflected the eras might be in order, such as "age of sail", or "renaissance", although you could start to get tag overload if we headed full steam in that direction.
I've done a bunch of work on tag wikis over the last two or three weeks. I'm working my way through the tags page by frequency of use, which should at least give us the basis for some content that we, as site users, can all improve on.
If only there were more questions on the areas of history I know most about (mainly High Mediæval to Early Modern Europe, plus some aspects of European colonialism) then I could contribute in a more obviously-useful manner ;o)
Anyway, my suggested text was accepted last week, so we have some content on the tag wiki now, at least.