diff --git a/src/ol/control/Navigation.js b/src/ol/control/Navigation.js
index d38cecdc9b..25427736ad 100644
--- a/src/ol/control/Navigation.js
+++ b/src/ol/control/Navigation.js
@@ -55,7 +55,7 @@ ol.control.Navigation.prototype.deactivate = function() {
 };
 
 /**
- * @param {Object} evt
+ * @param {{deltaX, deltaY}} evt
  */
 ol.control.Navigation.prototype.moveMap = function(evt) {
     this.map_.moveByViewportPx(evt.deltaX, evt.deltaY);
@@ -63,7 +63,7 @@ ol.control.Navigation.prototype.moveMap = function(evt) {
 };
 
 /**
- * @param {Event} evt
+ * @param {goog.events.MouseWheelEvent} evt
  */
 ol.control.Navigation.prototype.zoomMap = function(evt) {
     var me = this;
diff --git a/src/ol/handler/MouseWheel.js b/src/ol/handler/MouseWheel.js
index ac0a3e4682..6a551db20c 100644
--- a/src/ol/handler/MouseWheel.js
+++ b/src/ol/handler/MouseWheel.js
@@ -23,6 +23,9 @@ ol.handler.MouseWheel = function(map, elt) {
     var handler = new goog.events.MouseWheelHandler(elt);
     this.registerDisposable(handler);
 
+    /**
+     * @param {goog.events.MouseWheelEvent} e
+     */
     var handleMouseWheel = function(e) {
         e.position = goog.style.getRelativePosition(e, elt);
         e.type = 'mousewheel';