Who Wrote V?

When I went to school this morning, I noticed that they changed the poster in the shed where I usually wait for the bus. The new poster was a movie ad of V for Vendetta. I've read the graphic novel and it is one of my favorites. That's why I'm excited about the movie (Natalie Portman is in it too). But I was a bit surprised, and exasperated, when I read the bottom tagline:

"An uncompromising vision of the future from the creators of the Matrix trilogy"

The Wachowski brothers have the gall to proclaim that V for Vendetta is their vision of the future when two guys, named Alan Moore and David Lloyd, wrote and created V. I don't know why they're doing this? Did I just misunderstood them, or are they doing these for some reason?