diff --git a/src/viewer.js b/src/viewer.js
index 93171d0f..9537115a 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2902,10 +2902,11 @@ function onCanvasKeyPress( event ) {
      * @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised this event.
      * @property {Object} originalEvent - The original DOM event.
      * @property {Boolean} preventDefaultAction - Set to true to prevent default keyboard behaviour. Default: false.
-     * @property {Boolean} preventVerticalPan - Set to true to prevent keyboard vertical panning. Default: false.
-     * @property {Boolean} preventHorizontalPan - Set to true to prevent keyboard horizontal panning. Default: false.
+     * @property {Boolean} preventVerticalPan - Set to true to prevent keyboard vertical panning. Default: false. It has no longer any effect.
+     * @property {Boolean} preventHorizontalPan - Set to true to prevent keyboard horizontal panning. Default: false. It has no longer any effect.
      * @property {?Object} userData - Arbitrary subscriber-defined object.
      */
+
     this.raiseEvent('canvas-key-press', canvasKeyPressEventArgs);
 }
 function onCanvasClick( event ) {