diff --git a/playground/rmgi/demo/3p-form2-uischema.json b/playground/rmgi/demo/3p-form2-uischema.json
index 3ce53f8e..9b4ba142 100644
--- a/playground/rmgi/demo/3p-form2-uischema.json
+++ b/playground/rmgi/demo/3p-form2-uischema.json
@@ -1,3 +1,12 @@
-{"name":{     "ui:options": {
-        "readonly": true
-      }}}
\ No newline at end of file
+{
+  "name": {
+    "ui:options": {
+      "readonly": true
+    }
+  },
+  "rate": {
+    "ui:options": {
+      "required": true
+    }
+  }
+}
\ No newline at end of file