Guardians of the Galaxy director James Gunn put to rest any remaining questions surrounding Vin Diesel's role by posting this picture of Diesel with the tree-like Groot on Facebook. Soon we'll find out how many ways Diesel can say, "I am Groot!"

It's not exactly a surprise that Diesel is voicing Groot (there is even footage of him walking around on tree stilts for his mo-cap performance), but it hasn't been officially announced until now. Gunn posted this image with the following text:

Yep it is completely official. AND he's amazing. I never knew someone could say I AM GROOT so many different ways and with such feeling (and that sounds like I'm kidding but I'm not!)

He also wrote:

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Also I hope this puts to rest all the silly Thanos-Vin stuff which people just seemed to make up out of nothing.

Marvel also posted an announcement confirming Diesel's role.