...and antacids aren't helping!

I've been playing around with softbody stuff, and I've made a nice little flag on a flagpole.  The fabric simulation is working OK, (it falls and swirls around under the force of gravity), but I've also been trying to add an 'empty' and turn it into a wind force.

But no matter what I do, I can't get it to affect the flag in any way.  Am I missing a step?  I have a working, flag, and I have the wind generator... Do I have to do something to specifically link the two?

Thanks!

Morph