diff --git a/documentation/user-guide-basics/simple-UISchema.json b/documentation/user-guide-basics/simple-UISchema.json
index 44181636..aea27e78 100644
--- a/documentation/user-guide-basics/simple-UISchema.json
+++ b/documentation/user-guide-basics/simple-UISchema.json
@@ -1,6 +1,6 @@
 {
   "firstName": {
-    "ui:readonly": true,
+    "ui:readonly",
     "ui:emptyValue": "",
     "ui:autocomplete": "family-name",
     "ui:help": " "