 Absolutely. All that is is mold that's built up on your – you'll see it more on the north side of your roof, but you can get it anywhere. Believe it or not, if your neighbor's roof is moldy and you've had hedgers cleaned, it can jump over to your roof again. It's like an artillery-type mold. It can jump 20-plus feet. I know that sounds crazy, but it doesn't happen. Yeah, how did it get on the roof in the first place? It must have been that wind, huh?