In SWIFT how to add custom view in storyboard

Question

I created custom view class.

import UIKit

class CustomView: UIView {

    init(frame: CGRect) {
        super.init(frame: frame)
        // Initialization code
    }

    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect)
    {
        // Drawing code
    }
    */

}

But i don't know how to include created custom view in Storyboard because i heard that we can add custom views in storyboard design.