Train left front tire meaning?

My Ford Expedition left front tire got this message as started it tonite. It said "Train Left Front tire" What does this mean?

Id

No

Sure

☆ Sent from iOS Dr. Know! 1.1.04

It means that you need to "train" the tire pressure monitoring system. Cars these days commonly use TPMS sensors that monitor the air pressure in the wheels. The sensors each communicate with the vehicle through an access point at each wheel that they have to be "trained" or programmed to communicate with.