Can a goalkeeper shout keepers on a one on one

This came up in a recent game, our keeper shouted keepers whilst coming out on a 1v1 with a striker.

the other manger complained.

i have been told by goal keeper coaches that this good goalkeeper communication with his defenders to let them know that he is going to the ball and the defender is to go to the goal line if the striker goes past the keeper 

any clarification would be most appreciated