Useless trick. If you want to include the period at the end of the URL, you just have to put another punctuation mark following the URL. Like http://en.wikipedia.org/wiki/Griggs_v._Duke_Power_Co., or (http://en.wikipedia.org/wiki/Griggs_v._Duke_Power_Co.) or http://en.wikipedia.org/wiki/Griggs_v._Duke_Power_Co.. (I figured this out from reading the source code after getting tripped up by wrong URLs when the URL finished the sentence in a parenthetical comment. I can't promise that it won't break at some point.)