arduino uno board regulators

[monsterfactory]

hello, I opened the eagle files about arduino uno, and I noticed there are two 5 volt regulators
I think only one is used when the board is produced, but why are there both on the project?

[retrolefty]

Just to show that there are two possible regulator types that can be installed at assembly time. Allows for better flexibility/inventory control when procuring parts for building boards in batch assemblies.

Lefty

[monsterfactory]

Great, thanks!