diff --git a/openapiv2/core/service.swagger.yaml b/openapiv2/core/service.swagger.yaml
index 065d6ca5..14f09c36 100644
--- a/openapiv2/core/service.swagger.yaml
+++ b/openapiv2/core/service.swagger.yaml
@@ -1602,9 +1602,9 @@ definitions:
   v1betaCreditPurchase:
     type: object
     properties:
-      owner_uid:
+      owner:
         type: string
-        description: The credit owner UID.
+        description: The credit owner ID, e.g. `users/evian-wombat`.
         readOnly: true
       invoice_number:
         type: string