diff --git a/api/v1/swagger/definitions/hold.yaml b/api/v1/swagger/definitions/hold.yaml
index af3cd55087..9016ca654f 100644
--- a/api/v1/swagger/definitions/hold.yaml
+++ b/api/v1/swagger/definitions/hold.yaml
@@ -107,6 +107,10 @@ properties:
       - "null"
     description: If record level hold, the optional itemtype of the item the patron is
       requesting
+  hold_group_id:
+    type:
+      - integer
+      - "null"
   item_level:
     type: boolean
     description: If the hold is placed at item level