I've forgotten: how do you set rpm to show arch?

[sean <seandarcy2 gmail com>]

On another machine, I have it set up so that any user sees 
the arch on a rpm query.

i.e:

rpm -q gimp
gimp-2.2.13-1.fc6.x86_64

How did I do that? I assume I meesed with something in 
/usr/lib/rpm.

But what??

sean