Question about location of robots.txt file

I am using the sitemap plugin from my forum root.

Should I have an additional robots.txt file in the forum root, or just the one in my top level root folder (public.html)?

Spiders only look for robots.txt in the root. Just make sure you use full, absolute, paths when listing exclusions.

/forum/showpost.php
etc

thought that was the case, just wanted to be sure.

Thanks