docs: function(start, end) {
  			var annotationModel = this.getAnnotationModel();
  			if(annotationModel) {
  				var foldingAnnotation = new mAnnotations.FoldingAnnotation(start, end, this.getTextView().getModel());
  				annotationModel.addAnnotation(foldingAnnotation);
  				return foldingAnnotation;
  			}
  			return null;
  		}