Charge your Apple Watch from your iPhone

This could be incredibly useful...

Interestingly enough, it's actually possible to charge an Apple Watch using an iPhone — provided that a user has both a compatible charging cable and a supported iPhone model with enough charge at the ready. Here's what we know about how to charge the Apple Watch through an iPhone and which specific phone models and components are capable of carrying out the process… More here.

Surprised that Apple doesn’t mention this more.