diff --git a/src/overlay.js b/src/overlay.js
index 25cc50d2..7ad7a646 100644
--- a/src/overlay.js
+++ b/src/overlay.js
@@ -41,6 +41,7 @@
      * compatibility.
      * @member OverlayPlacement
      * @memberof OpenSeadragon
+     * @see OpenSeadragon.Placement
      * @static
      * @readonly
      * @type {Object}
@@ -400,7 +401,7 @@
          * @param {OpenSeadragon.Point|OpenSeadragon.Rect|Object} location
          * If an object is specified, the options are the same than the constructor
          * except for the element which can not be changed.
-         * @param {OpenSeadragon.Placement} position
+         * @param {OpenSeadragon.Placement} placement
          */
         update: function(location, placement) {
             var options = $.isPlainObject(location) ? location : {