diff --git a/src/viewer.js b/src/viewer.js
index 3e318528..f93c8e23 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -1710,7 +1710,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
      * is closed which include when changing page.
      * @method
      * @param {Element|String|Object} element - A reference to an element or an id for
-     *      the element which will overlayed. Or an Object specifying the configuration for the overlay
+     *      the element which will be overlayed. Or an Object specifying the configuration for the overlay
      * @param {OpenSeadragon.Point|OpenSeadragon.Rect} location - The point or
      *      rectangle which will be overlayed.
      * @param {OpenSeadragon.OverlayPlacement} placement - The position of the
@@ -1770,6 +1770,8 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
      * Updates the overlay represented by the reference to the element or
      * element id moving it to the new location, relative to the new placement.
      * @method
+     * @param {Element|String} element - A reference to an element or an id for
+     *      the element which is overlayed.
      * @param {OpenSeadragon.Point|OpenSeadragon.Rect} location - The point or
      *      rectangle which will be overlayed.
      * @param {OpenSeadragon.OverlayPlacement} placement - The position of the