diff --git a/src/ol/tilegrid/tilegrid.js b/src/ol/tilegrid/tilegrid.js
index dccaae5723..1aa8d0bd4b 100644
--- a/src/ol/tilegrid/tilegrid.js
+++ b/src/ol/tilegrid/tilegrid.js
@@ -176,6 +176,7 @@ ol.tilegrid.TileGrid.prototype.getResolution = function(z) {
 
 /**
  * @return {Array.<number>} Resolutions.
+ * @todo api
  */
 ol.tilegrid.TileGrid.prototype.getResolutions = function() {
   return this.resolutions_;