diff --git a/playground/nutech/receipt/timertfc-schema.json b/playground/nutech/receipt/timertfc-schema.json
index 44e23379..fbace270 100644
--- a/playground/nutech/receipt/timertfc-schema.json
+++ b/playground/nutech/receipt/timertfc-schema.json
@@ -12,7 +12,7 @@
     "time_format":{
       "type": "string",
       "title": "Time format",
-      "enum": ["Option 1", "Option 2', 'Option 3'],
+      "enum": ["Option 1", "Option 2", 'Option 3'],
     }
   }
 }
\ No newline at end of file