         }
     }
     
+    /**
+    Progress bar colors. You can set many colors in `colors` property, and it makes gradation color in `colors`.
+    */
     public var colors: [UIColor]? {
         willSet {
             updateColors(newValue)
         }
     }
     
+    /**
+    Progress guide bar color.
+    */
     @IBInspectable public var progressGuideColor: UIColor = UIColor(red: 0.1, green: 0.1, blue: 0.1, alpha: 0.2) {
         willSet {
             guideLayer?.backgroundColor = newValue.CGColor
         }
     }
 
+    /**
+    Switch of progress guide view. If you set to `true`, progress guide view is enabled.
+    */
     @IBInspectable public var showProgressGuide: Bool = false {
         willSet {
             configureProgressGuideLayer(newValue)

        }
    }
    
    public var startAngle: Double = 0.0 {
        didSet {
            progressView.startAngle = oldValue

        }
    }
    
    /**
    Progress end angle.
    */
    public var endAngle: Double = 0.0 {
        didSet {
            progressView.endAngle = oldValue
