diff --git a/src/ol/renderer/canvas/canvasimagelayerrenderer.js b/src/ol/renderer/canvas/canvasimagelayerrenderer.js
index 683449b737..7f17c14ee3 100644
--- a/src/ol/renderer/canvas/canvasimagelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasimagelayerrenderer.js
@@ -55,6 +55,7 @@ ol.renderer.canvas.ImageLayer.prototype.forEachFeatureAtPixel =
   return source.forEachFeatureAtPixel(extent, resolution, rotation, coordinate,
       /**
        * @param {ol.Feature} feature Feature.
+       * @return {?} Callback result.
        */
       function(feature) {
         return callback.call(opt_obj, feature, this);
diff --git a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
index f0c6eb4df4..d1c973e293 100644
--- a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
@@ -104,6 +104,7 @@ ol.renderer.canvas.VectorLayer.prototype.forEachFeatureAtPixel =
         /**
          * @param {ol.geom.Geometry} geometry Geometry.
          * @param {Object} data Data.
+         * @return {?} Callback result.
          */
         function(geometry, data) {
           var feature = /** @type {ol.Feature} */ (data);
diff --git a/src/ol/renderer/dom/domimagelayerrenderer.js b/src/ol/renderer/dom/domimagelayerrenderer.js
index 9f2a0bd68a..62637b0548 100644
--- a/src/ol/renderer/dom/domimagelayerrenderer.js
+++ b/src/ol/renderer/dom/domimagelayerrenderer.js
@@ -60,6 +60,7 @@ ol.renderer.dom.ImageLayer.prototype.forEachFeatureAtPixel =
   return source.forEachFeatureAtPixel(extent, resolution, rotation, coordinate,
       /**
        * @param {ol.Feature} feature Feature.
+       * @return {?} Callback result.
        */
       function(feature) {
         return callback.call(opt_obj, feature, this);
diff --git a/src/ol/renderer/webgl/webglimagelayerrenderer.js b/src/ol/renderer/webgl/webglimagelayerrenderer.js
index a1588b1d28..466fa0f8ed 100644
--- a/src/ol/renderer/webgl/webglimagelayerrenderer.js
+++ b/src/ol/renderer/webgl/webglimagelayerrenderer.js
@@ -86,6 +86,7 @@ ol.renderer.webgl.ImageLayer.prototype.forEachFeatureAtPixel =
   return source.forEachFeatureAtPixel(extent, resolution, rotation, coordinate,
       /**
        * @param {ol.Feature} feature Feature.
+       * @return {?} Callback result.
        */
       function(feature) {
         return callback.call(opt_obj, feature, this);
diff --git a/src/ol/source/imagevectorsource.js b/src/ol/source/imagevectorsource.js
index 28886bef58..81a790bf89 100644
--- a/src/ol/source/imagevectorsource.js
+++ b/src/ol/source/imagevectorsource.js
@@ -160,6 +160,7 @@ ol.source.ImageVector.prototype.forEachFeatureAtPixel =
         /**
          * @param {ol.geom.Geometry} geometry Geometry.
          * @param {Object} data Data.
+         * @return {?} Callback result.
          */
         function(geometry, data) {
           var feature = /** @type {ol.Feature} */ (data);