how to identify a genuine mac charger

not exactly a question, i've had this problem these past few days and just recently discovered how to do it so i want to share with the community.

1. plug the charger and connect the mac.
2. hold down the OPTION key and click the apple logo in the top-left corner of the screen, then System Settings...
3. click on Power in the left-hand column

if the charger is genuine, this will show the manufacturer as Apple Inc. along with other information