Dear Editor, Re: V for Vendetta review by Marc Savlov [Film Listings, March 17]: Just a quick correction from a comic book nerd: Alan Moore, as far as I can verify, never wrote anything called The Dark Knight. I believe you may be confusing The Dark Knight Returns, a four-part series by Frank Miller about an aged Bruce Wayne. It is undoubtedly one of Miller's best works and possibly confusing because it was released at approximately a year before Moore's The Watchmen (which is still a contender for the best graphic novel ever written). This is minor in comparison to the great work you do, Mr. Savlov, but two great stories by two great writers seems worth the distinction.