starting a stored procedure+rule AFTER an insert

Hi, Newbie here,

I have implemented a stored procedure that writes out the newest DB entry on
insert, and combined it with a rule.

1) create function newcache() returns void AS 'newCache', 'newCache'
language c;
2) create rule newcacherule AS on insert to caches do also select
newcache();

The problem is that newcacherule fires BEFORE the insert has taken place, so
effectively, I always just get the 2nd newest entry to write into my text
file while the newest entry is "stuck in the queue" until a new insert come.
How can I execute my rule AFTER the insert has taken place?

Thanks for reading!