htaccess help

[CNY750Rider]

We moved our forum directory from:

/forum to /forums

I would like to put a 301 rewrite mod in our htaccess file to forward all traffic (whom get a 404 error right now :-( ) to the new directory and reduce most of the 404's

Can someone help, I've tried a couple generators and a couple sites that discuss this but I am doing something wrong as I keep getting a internal server error.

[mokujin]

//301 Redirect Entire Directory
RedirectMatch 301 forum(.*) forums/$1

Try this :D