diff --git a/app/scripts/lib/notification-manager.js b/app/scripts/lib/notification-manager.js
index ce4825d5b..5dfb42078 100644
--- a/app/scripts/lib/notification-manager.js
+++ b/app/scripts/lib/notification-manager.js
@@ -12,6 +12,11 @@ class NotificationManager {
    *
    */
 
+  /**
+   * Either brings an existing MetaMask notification window into focus, or creates a new notification window. New
+   * notification windows are given a 'popup' type.
+   *
+   */
   showPopup () {
     this._getPopup((err, popup) => {
       if (err) throw err
@@ -32,6 +37,10 @@ class NotificationManager {
     })
   }
 
+  /**
+   * Closes a MetaMask notification if it window exists.
+   *
+   */
   closePopup () {
     // closes notification popup
     this._getPopup((err, popup) => {
@@ -41,10 +50,14 @@ class NotificationManager {
     })
   }
 
-  //
-  // Private
-  //
-
+  /**
+   * Checks all open MetaMask windows, and returns the first one it finds that is a notification window (i.e. has the
+   * type 'popup')
+   *
+   * @private
+   * @param {Function} cb A node style callback that to whcih the found notification window will be passed.
+   *
+   */
   _getPopup (cb) {
     this._getWindows((err, windows) => {
       if (err) throw err
@@ -52,6 +65,13 @@ class NotificationManager {
     })
   }
 
+  /**
+   * Returns all open MetaMask windows.
+   *
+   * @private
+   * @param {Function} cb A node style callback that to which the windows will be passed.
+   *
+   */
   _getWindows (cb) {
     // Ignore in test environment
     if (!extension.windows) {
@@ -63,6 +83,13 @@ class NotificationManager {
     })
   }
 
+  /**
+   * Given an array of windows, returns the first that has a 'popup' type, or null if no such window exists.
+   *
+   * @private
+   * @param {array} windows An array of objects containing data about the open MetaMask extension windows.
+   *
+   */
   _getPopupIn (windows) {
     return windows ? windows.find((win) => {
       // Returns notification popup