diff --git a/src/ol/source/vectorsource.js b/src/ol/source/vectorsource.js
index 03b4ffb3b6..b8e32af113 100644
--- a/src/ol/source/vectorsource.js
+++ b/src/ol/source/vectorsource.js
@@ -346,6 +346,7 @@ ol.source.Vector.prototype.getExtent = function() {
  *
  * @param {string|number} id Feature identifier.
  * @return {ol.Feature} The feature (or `null` if not found).
+ * @todo api
  */
 ol.source.Vector.prototype.getFeatureById = function(id) {
   var feature = this.idIndex_[id.toString()];