diff --git a/code/src/functions/external-system/initial_domain_mapping.json b/code/src/functions/external-system/initial_domain_mapping.json
index a59e963..3c4cece 100644
--- a/code/src/functions/external-system/initial_domain_mapping.json
+++ b/code/src/functions/external-system/initial_domain_mapping.json
@@ -150,6 +150,7 @@
           }
         ]
       }
-    }
+    },
+    "format_version": "v0.2.0"
   }
 }