diff --git a/client/src/app-portal.js b/client/src/app-portal.js
index fa67fdcab3..a031470fb4 100644
--- a/client/src/app-portal.js
+++ b/client/src/app-portal.js
@@ -31,7 +31,14 @@ function (
     Dep,
     /** typeof module:acl-portal-manager.Class */ AclPortalManager
 ) {
-    return Dep.extend({
+    /**
+     * A portal application class.
+     * @class
+     * @name Class
+     * @extends module:app.Class
+     * @memberOf module:app-portal
+     */
+    return Dep.extend(/** @lends module:app-portal.Class# */{
 
         /**
          * @inheritDoc
diff --git a/client/src/app.js b/client/src/app.js
index d29a61f086..02661fdde9 100644
--- a/client/src/app.js
+++ b/client/src/app.js
@@ -141,41 +141,49 @@ function (
 
         /**
          * @private
+         * @type {boolean}
          */
         useCache: false,
 
         /**
          * @private
+         * @type {module:models/user.Class}
          */
         user: null,
 
         /**
          * @private
+         * @type {module:models/preferences.Class}
          */
         preferences: null,
 
         /**
          * @private
+         * @type {module:models/settings.Class}
          */
         settings: null,
 
         /**
          * @private
+         * @type {module:metadata.Class}
          */
         metadata: null,
 
         /**
          * @private
+         * @type {module:language.Class}
          */
         language: null,
 
         /**
          * @private
+         * @type {module:field-manager.Class}
          */
         fieldManager: null,
 
         /**
          * @private
+         * @type {module:cache.Class}
          */
         cache: null,
 
@@ -185,17 +193,23 @@ function (
         loader: null,
 
         /**
+         * An API URL.
+         *
          * @private
          */
         apiUrl: 'api/v1',
 
         /**
+         * An auth credentials string.
+         *
          * @private
+         * @type {string|null}
          */
         auth: null,
 
         /**
          * @private
+         * @type {module:controllers/base.Class}
          */
         baseController: null,
 
@@ -206,16 +220,19 @@ function (
 
         /**
          * @private
+         * @type {module:router.Class}
          */
         router: null,
 
         /**
          * @private
+         * @type {module:model-factory.Class}
          */
         modelFactory: null,
 
         /**
          * @private
+         * @type {module:collection-factory.Class}
          */
         collectionFactory: null,
 
@@ -231,6 +248,7 @@ function (
 
         /**
          * @private
+         * @type {module:view-helper.Class}
          */
         viewHelper: null,
 
@@ -238,16 +256,19 @@ function (
          * A body view.
          *
          * @protected
+         * @type {string}
          */
         masterView: 'views/site/master',
 
         /**
          * @private
+         * @type {Cache|null}
          */
         responseCache: null,
 
         /**
          * @private
+         * @type {module:broadcast-channel.Class|null}
          */
         broadcastChannel: null,
 
diff --git a/client/src/broadcast-channel.js b/client/src/broadcast-channel.js
index e99188ac0d..5082950edc 100644
--- a/client/src/broadcast-channel.js
+++ b/client/src/broadcast-channel.js
@@ -28,7 +28,10 @@
 
 define('broadcast-channel', [], function () {
 
-    return class {
+    /**
+     * @memberOf module:broadcast-channel
+     */
+    class Class {
         constructor() {
             this.object = null;
 
@@ -37,6 +40,11 @@ define('broadcast-channel', [], function () {
             }
         }
 
+        /**
+         * Post a message.
+         *
+         * @param {string} message A message.
+         */
         postMessage(message) {
             if (!this.object) {
                 return;
@@ -45,6 +53,17 @@ define('broadcast-channel', [], function () {
             this.object.postMessage(message);
         }
 
+        /**
+         * @callback module:broadcast-channel.Class~callback
+         *
+         * @param {Event} event An event. A message can be obtained from the `data` property.
+         */
+
+        /**
+         * Subscribe to a message.
+         *
+         * @param {module:broadcast-channel.Class~callback} callback A callback.
+         */
         subscribe(callback) {
             if (!this.object) {
                 return;
@@ -52,5 +71,7 @@ define('broadcast-channel', [], function () {
 
             this.object.addEventListener('message', callback);
         }
-    };
+    }
+
+    return Class;
 });