diff --git a/ko-cart/js/viewmodel.js b/ko-cart/js/viewmodel.js
index c91dfc9..dcd391f 100644
--- a/ko-cart/js/viewmodel.js
+++ b/ko-cart/js/viewmodel.js
@@ -91,7 +91,9 @@ var vm = (function () {
     addProduct: addProduct,
     // second chapter
     cart: cart,
-    showCartDetails: showCartDetails
+    showCartDetails: showCartDetails,
+    totalItems: totalItems,
+    grandTotal: grandTotal
   };
 })();
 ko.applyBindings(vm);