         adjustLight()
     }
 
-    // MARK: - Private methods
+    // MARK: Helper functions
 
     private func adjustLight() {
         // Adjust screen brightness.


                UIView.animateWithDuration(1.0, animations: { [unowned self] in
                    self.brightnessLabel.alpha = 0.0
                    })

            case .Cancelled, .Failed:
                resetBrightness()


        return formatter
    }()

    // MARK: Life cycle

    override func viewDidLoad() {
        super.viewDidLoad()
