diff --git a/ionic/components/nav/nav-controller.ts b/ionic/components/nav/nav-controller.ts
index bf984d76e9..5f46ecf174 100644
--- a/ionic/components/nav/nav-controller.ts
+++ b/ionic/components/nav/nav-controller.ts
@@ -220,7 +220,7 @@ export class NavController extends Ion {
    *      },{
    *       // here we can configure things like the animations direction or
    *       // or if the view should animate at all.
-   *       direction: back
+   *       direction: 'back'
    *      });
    *    }
    * }