Xamarin.Forms Font is obsolete

When I am trying to create anew label on Xamarin.Forms, I get the following Warning:

about = new Label { Text = "" ,      
                TextColor=Color.Black,
                Font = Font.SystemFontOfSize(16),//Warning occurred here 
                XAlign = TextAlignment.End,
                HorizontalOptions = LayoutOptions.EndAndExpand};

'Xamarin.Forms.Label.Font' is obsolete: 'Please use the Font attributes which are on the class itself. Obsoleted in v1.3.0'

What this warning means and what I should do?