diff --git a/mdc_100_series/lib/app.dart b/mdc_100_series/lib/app.dart
index 1da4b18043..e778df15c1 100644
--- a/mdc_100_series/lib/app.dart
+++ b/mdc_100_series/lib/app.dart
@@ -13,18 +13,27 @@
 // limitations under the License.
 
 import 'package:flutter/material.dart';
-
+// TODO: Import backdrop.dart (104)
 import 'colors.dart';
 import 'home.dart';
 import 'login.dart';
+// TODO: Import CategoryMenuPage (104)
 import 'supplemental/cut_corners_border.dart';
 
+// TODO: Convert ShrineApp to stateful widget(104)
 class ShrineApp extends StatelessWidget {
+  // TODO: Add variable for selected Category (104)
+  // TODO: Add a callback when a Category is tapped (104)
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Shrine',
+      // TODO: Change home: to a Backdrop with a HomePage frontLayer (104)
       home: HomePage(),
+      // TODO: Pass _currentCategory for frontLayer (104)
+      // TODO: Change backLayer field value to CategoryMenuPage (104)
+      // TODO: Make currentCategory field take _currentCategory
       initialRoute: '/login',
       onGenerateRoute: _getRoute,
       theme: _kShrineTheme,
diff --git a/mdc_100_series/lib/home.dart b/mdc_100_series/lib/home.dart
index 9abfcc8ccb..c7695b1ebc 100644
--- a/mdc_100_series/lib/home.dart
+++ b/mdc_100_series/lib/home.dart
@@ -19,8 +19,12 @@ import 'model/product.dart';
 import 'supplemental/asymmetric_view.dart';
 
 class HomePage extends StatelessWidget {
+  // TODO: Add a variable for Category (104)
+
   @override
   Widget build(BuildContext context) {
+    // TODO: Return an AsymmetricView (104)
+    // TODO: Pass Category variable to AsymmetricView (104)
     return Scaffold(
       appBar: AppBar(
         brightness: Brightness.light,
diff --git a/mdc_100_series/lib/supplemental/product_columns.dart b/mdc_100_series/lib/supplemental/product_columns.dart
index dfa9f63ddf..ad6be75006 100644
--- a/mdc_100_series/lib/supplemental/product_columns.dart
+++ b/mdc_100_series/lib/supplemental/product_columns.dart
@@ -33,8 +33,10 @@ class TwoProductCardColumn extends StatelessWidget {
 
       double heightOfCards = (constraints.biggest.height - spacerHeight) / 2.0;
       double heightOfImages = heightOfCards - ProductCard.kTextBoxHeight;
+      // TODO: Change imageAspectRatio calculation (104)
       double imageAspectRatio = constraints.biggest.width / heightOfImages;
 
+      // TODO: Replace Column with a ListView (104)
       return Column(
         mainAxisAlignment: MainAxisAlignment.center,
         crossAxisAlignment: CrossAxisAlignment.center,
@@ -71,6 +73,7 @@ class OneProductCardColumn extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    // TODO: Replace Column with a ListView (104)
     return Column(
       mainAxisAlignment: MainAxisAlignment.end,
       children: <Widget>[