upgrade from 7.0.2 to 7.0.3

I am running Linux RedHat 7.0 and other than making a backup copy of our
database, is there anything else that I should be aware before upgrading
postgresql from 7.0.2 to 7.0.3? It is important that I limit the downtime
other than the upgrade. Has anyone heard or read of any issues?

I assume if it is more involved than simply un-tarring the file in the
proper dir than there will be a README file with instructions or
something...

Thanks,

Rudy Laczkovich