diff --git a/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js b/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
index 3290ba462..3600bd6ef 100644
--- a/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
+++ b/Libraries/CustomComponents/Navigator/Navigation/NavigationRouteStack.js
@@ -1,5 +1,10 @@
 /**
- * Copyright 2004-present Facebook. All Rights Reserved.
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
  *
  * @providesModule NavigationRouteStack
  * @flow
@@ -135,7 +140,7 @@ class RouteStack {
     invariant(this._routeNodes.indexOf(route) === -1, 'route must be unique');
 
     // When pushing, removes the rest of the routes past the current index.
-    var routeNodes = this._routeNodes.withMutations((list: List) => {
+    var routeNodes = this._routeNodes.withMutations((list: List<RouteNode>) => {
       list.slice(0, this._index + 1).push(new RouteNode(route));
     });
 
@@ -232,7 +237,7 @@ class RouteStack {
     return new Set(items);
   }
 
-  _update(index: number, routeNodes: List): RouteStack {
+  _update(index: number, routeNodes: List<RouteNode>): RouteStack {
     if (this._index === index && this._routeNodes === routeNodes) {
       return this;
     }