spamc and extra rules

[Geoff Soper]

I call spamc from various .procmail files (relating to different users) 
as below:

| spamc
I want to add some extra rules for one of these users. From the spamc 
docs I thought I'd have to replace this with :

| spamc -F /path/to/file

but this didn't seem to have any effect.

Is this the right way of bringing in extra rules? I want these rules to 
be in addition to the ones in /etc/mail/spamassassin/local.cf and not 
instead of.

Thanks,
Geoff