My supervisor want me to add another professor to the authors part in my paper while... what should I do?

My supervisor wants me to include another professors name in my paper just because he was declared as my second adviser on the project. But the problem is that this man has not done anything but giving foolish and useless comments on my work. By foolish, I do not exaggerate since my supervisor thinks the same but it seems that he made a deal with the other one. What should I do? I cant really tolerate the fact that he will get acknowledged for the work which he doesn't know anything and didn't do anything about.