diff --git a/source/behavior/trading/trading.json b/source/behavior/trading/trading.json
index 66374337..6a6078d3 100644
--- a/source/behavior/trading/trading.json
+++ b/source/behavior/trading/trading.json
@@ -149,6 +149,7 @@
     }
   },
   "properties": {
+    "format_version": { "$ref": "../../general/format_version.json" },
     "tiers": {
       "type": "array",
       "title": "Tiers",