diff --git a/src/ol/control/rotatecontrol.js b/src/ol/control/rotatecontrol.js
index 8b64185d34..3aba7fdd17 100644
--- a/src/ol/control/rotatecontrol.js
+++ b/src/ol/control/rotatecontrol.js
@@ -34,6 +34,11 @@ ol.control.Rotate = function(opt_options) {
   var label = goog.dom.createDom(goog.dom.TagName.SPAN,
       { 'class': 'ol-compass' },
       goog.isDef(options.label) ? options.label : '\u21E7');
+
+  /**
+   * @type {Element}
+   * @private
+   */
   this.label_ = label;
 
   var tipLabel = goog.isDef(options.tipLabel) ?