diff --git a/src/openseadragon.js b/src/openseadragon.js
index 13e96eb1..4532ddbf 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -137,10 +137,10 @@
   *     {@link OpenSeadragon.LegacyTileSource}.
   *
   * @property {Array} overlays Array of objects defining permanent overlays of
-  *     the viewer. The overlays added via this options and later removed with
+  *     the viewer. The overlays added via this option and later removed with
   *     {@link OpenSeadragon.Viewer#removeOverlay} will be added back when a new
   *     image is opened.
-  *     To add overlays which can be definitly removed, one must use
+  *     To add overlays which can be definitively removed, one must use
   *     {@link OpenSeadragon.Viewer#addOverlay}
   *     If displaying a sequence of images, the overlays can be associated
   *     with a specific page by passing the overlays array to the page's
@@ -149,13 +149,13 @@
   *     * x, y, (or px, py for pixel coordinates) to define the location.
   *     * width, height in point if using x,y or in pixels if using px,py. If width
   *       and height are specified, the overlay size is adjusted when zooming,
-  *       otherwise the size stay the size of the content (or the size defined by CSS).
+  *       otherwise the size stays the size of the content (or the size defined by CSS).
   *     * className to associate a class to the overlay
   *     * id to set the overlay element. If an element with this id already exists,
   *       it is reused, otherwise it is created. If not specified, a new element is
   *       created.
   *     * placement a string to define the relative position to the viewport.
-  *       Only used if no width and height are specified. Default: TOP_LEFT.
+  *       Only used if no width and height are specified. Default: 'TOP_LEFT'.
   *       See {@link OpenSeadragon.OverlayPlacement} for possible values.
   *
   * @property {String} [xmlPath=null]