diff --git a/src/tiledimage.js b/src/tiledimage.js
index cc2c32d3..6fb68413 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -85,7 +85,11 @@
  */
 $.TiledImage = function( options ) {
     var _this = this;
-
+    /**
+     * The {@link OpenSeadragon.TileSource} that defines this TiledImage.
+     * @member {OpenSeadragon.TileSource} source
+     * @memberof OpenSeadragon.TiledImage#
+     */
     $.console.assert( options.tileCache, "[TiledImage] options.tileCache is required" );
     $.console.assert( options.drawer, "[TiledImage] options.drawer is required" );
     $.console.assert( options.viewer, "[TiledImage] options.viewer is required" );
diff --git a/src/viewer.js b/src/viewer.js
index a8706001..c9bc2c99 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -145,6 +145,8 @@ $.Viewer = function( options ) {
 
         //These are originally not part options but declared as members
         //in initialize.  It's still considered idiomatic to put them here
+        //source is here for backwards compatibility. It is not an official
+        //part of the API and should not be relied upon.
         source:         null,
         /**
          * Handles rendering of tiles in the viewer. Created for each TileSource opened.
@@ -152,6 +154,11 @@ $.Viewer = function( options ) {
          * @memberof OpenSeadragon.Viewer#
          */
         drawer:             null,
+        /**
+         * Keeps track of all of the tiled images in the scene.
+         * @member {OpenSeadragon.Drawer} world
+         * @memberof OpenSeadragon.Viewer#
+         */
         world:              null,
         /**
          * Handles coordinate-related functionality - zoom, pan, rotation, etc. Created for each TileSource opened.