Text area size

I seem to have a difficulty changing the text area size of the comment form. I’ve already change the values in the comments.php of my current theme but it seems not to work.

[post edited]
Please don’t mind this message. I have already settled this. I’ve found out that you also have to change the text area size on the comments.php to make it work.

Anyway, to all who also struggles with their comment text area box, this could serve as an answer.