diff --git a/src/ol/map.js b/src/ol/map.js
index b184c60fa2..4aef67403a 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -470,6 +470,7 @@ ol.Map.prototype.disposeInternal = function() {
  */
 ol.Map.prototype.forEachFeatureAtPixel =
     function(pixel, callback, opt_obj, opt_layerFunction, opt_obj2) {
+  // FIXME this function should probably take an options object
   return this.renderer_.forEachFeatureAtPixel(
       pixel, callback, opt_obj, opt_layerFunction, opt_obj2);
 };