.htaccess wizards, help

[tnk]

Hi

I need some help and would really appreciate it as I find it very tricky. I have a website which is currently redirected to a subfolder

Eg: domain-.com/subfolder

Now I dont want it to goto subfolder but since its and old site many people have bookmarked articles with /subfolder

I have already organized my code under main domain-.com

So I wanted to redirect anyone visiting domain-.com/subfolder/xyz to domain-.com/xyz so I wrote the following code which does not seem to work
Code:
RewriteRule /sub-folder/(.*) /$1 [R=301,NC,L]

So if you request /subfolder/foo.html
you will be told that the page has moved permanently to
/foo.html

Is there something wrong with this ? Can you help ?

Thanks a lot.