[CentOS] ath9k in CentOS 5

Hi,

I'm thinking about updating the wireless card on a CentOS 5.3 box.

The Wiki at http://wiki.centos.org/HowTos/Laptops/Wireless says that
the "ath9k driver ships with CentOS", but I can't find it.  I've tried
modinfo, locate, yum search, and yum provides, but they all come up
empty.  Am I missing something, or is the Wiki need correcting?  I've
also searched the CentOS forums and others share my confusion.

Thanks,
Jim