Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This Caitlyn Build is one I saw and modified. Now first you are probably wondering why I have clairvoyance well if you use it with your ultimate it is a great help like lets say a weak enemy went in to the fog of war you lose sight of him, just clairvoyance and ult that champ straight to hell... so ya this build is awesome and works quite well...