Kite Demo Mask

Hey guys in the Kite Demo, the Overview map has all of the assets used. Specifically the grass asset has this mask, but what is the whole point of it? Doesnt look like anything to the actual grass texture, so what does it do?

I believe the mask you’re referring to is the grass texture node mask, which will place grass from a grass node on a material. If that’s not it, pictures would be worthwhile!

Im talking about this mask http://prntscr.com/a879u4