diff --git a/model-desc/c3dc-model-props.yml b/model-desc/c3dc-model-props.yml
index 6b2fe9a..f073273 100644
--- a/model-desc/c3dc-model-props.yml
+++ b/model-desc/c3dc-model-props.yml
@@ -3039,6 +3039,7 @@ PropDefinitions:
         Version: "1.00"
     Type:
       value_type: list
+      item_type: string
     Req: true
     Strict: true
     Private: false