Source: James Gunn

We may only be able to hear the same few words whenever Groot speaks, but he is really saying so much more.

For Vin Diesel, it isn’t guess work when he lends his voice to Groot. He doesn’t have to wonder what Groot really means because writer and director James Gunn spells it out in Groot’s very own script. Just as he did on Guardians of the Galaxy, Gunn has written a “Groot version” of the Guardians of the Galaxy Vol. 2 script that lets Diesel know exactly what every “I am Groot” means. Gunn shared the cover of that script on Facebook.

Guardians of the Galaxy Vol. 2 is due in theaters May 5, 2017.