diff --git a/Libraries/CustomComponents/Navigator/Navigator.js b/Libraries/CustomComponents/Navigator/Navigator.js
index d37490a60..a12b49e9a 100644
--- a/Libraries/CustomComponents/Navigator/Navigator.js
+++ b/Libraries/CustomComponents/Navigator/Navigator.js
@@ -236,8 +236,9 @@ var Navigator = React.createClass({
     onDidFocus: PropTypes.func,
 
     /**
-     * Optionally provide a navigation bar that persists across scene
-     * transitions
+     * Optionally provide a component as navigation bar that persists across scene
+     * transitions. The component will receive two props: `navigator` and `navState`.
+     * It will be rerendered when the routes change.
      */
     navigationBar: PropTypes.node,