Document ID for one folder only

Hi,

I've set up a site that at the minute contains 2 folders. One of the folders needs to have a unique prefix to indicate what type of document it is, and I've set this up using Document ID.

However, this is also applying itself to the other folder which I don't want. Is there a way to set up Document IDs for specific folders so that it doesn't apply to the entire site?

Thanks!