Annoying...

Since I'm writing the fanfic game I've added the word fanfic to Word's dictionary. But for some reason every time I type it Word insists on capitalising it, presumably because it thinks it's a name. It isn't showing up as an error if I put it back to lower case, but I'll probably use the word quite a few times - I really don't want to keep converting it manually. Anyone got any idea how I persuade it to leave it lower case?