Ford's letting some existing Ford car owners update their Ford Sync infotainment system, by releasing a Sync AppLink software upgrade.

Specifically, owners of 2010 Ford cars or newer will be able to download, install and load Ford's app integration system - called Sync AppLink - into their Ford Sync systems. Ford hasn't fully detailed which cars will support the software upgrade, but the cars must have Ford Sync.

Ford Sync is a factory-installed, integrated in-vehicle communications and entertainment system that first unveiled in January 2007. As for Ford's Sync AppLink, it first became available on the 2011 Ford Fiesta and supports more than 60 Android or iOS apps like Pandora and NPR.

Using Sync AppLink via Ford Sync, car owners can control their smartphones and apps with simple voice commands, some infotainment controls, and even steering wheel buttons.  The technology is available on all 2014 cars and even trucks like the F-150.

READ: Ford Sync with AppLink 2.0 arrives, we test out

Ford's Sync AppLink software upgrade will be available for more than 3.4 million additional vehicles later this year. And it'll be completely free.