This is another prime candidate for vandalism: a subject many people have heard of, but few people care about. Just sneak it in the article; nobody will notice, right?
That said, I love the reverter's simple comment: "the usual"
Every time xkcd updates, its more idiotic fans see fit to alter the Wikipedia article in question to make sure everyone knows that there has been an xkcd comic on the topic. This blog tracks the phenomenon.