code: 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;
  		}
docs: Creates and add a FoldingAnnotation to the editor.
  
  @param {Number} start The start offset of the annotation in the text model.
  @param {Number} end The end offset of the annotation in the text model.
  @returns {orion.editor.FoldingAnnotation} The FoldingAnnotation added to the editor.