In November, Ford Motor Company hit a critical milestone: its 10 millionth Sync-enabled vehicle rolled off the assembly line. But that doesn’t mean that Ford has built 10 million connected cars. Sync in its most basic form is a voice command-and-control system. AppLink, the in-car connectivity platform companion which allows apps in your smartphone to run in the dashboard, has only made it into 1 million Fords since it launched in 2010. Ford, however, said on Friday that it plans to boost that number considerably in coming months by retroactively installing AppLink in as many as 3.4 million Sync-enabled vehicles already on the road today. Ford hasn’t yet revealed any details about which vehicle models will be eligible for the upgrade or when they would receive it. It appears that process will involve a simple software download, though its unclear whether customers can install the software themselves or must go to the dealer.