diff --git a/playground/dan/pizza-palace/pizza-order-schema.json b/playground/dan/pizza-palace/pizza-order-schema.json
index 2cc2654e..a4654026 100644
--- a/playground/dan/pizza-palace/pizza-order-schema.json
+++ b/playground/dan/pizza-palace/pizza-order-schema.json
@@ -2,6 +2,7 @@
   "title": "Build your Pizza!",
   "description": "Select the size and toppings, we'll do the rest!",
   "type": "object",
+  "required"
   "properties": {
     "pizza_size": {
       "title": "What size pizza would you like?",