diff --git a/api-specs/api/types/order-edit/updates/StagedOrderAddParcelToDeliveryAction.raml b/api-specs/api/types/order-edit/updates/StagedOrderAddParcelToDeliveryAction.raml
index 8e34cece5..edce96eae 100644
--- a/api-specs/api/types/order-edit/updates/StagedOrderAddParcelToDeliveryAction.raml
+++ b/api-specs/api/types/order-edit/updates/StagedOrderAddParcelToDeliveryAction.raml
@@ -38,3 +38,7 @@ properties:
     type: DeliveryItem[]
     description: |
       Value to set.
+  custom?:
+    type: CustomFieldsDraft
+    description: |
+      Custom Fields for the Parcel.
diff --git a/api-specs/api/types/order/updates/OrderAddParcelToDeliveryAction.raml b/api-specs/api/types/order/updates/OrderAddParcelToDeliveryAction.raml
index cdf02ff85..12ede3c08 100644
--- a/api-specs/api/types/order/updates/OrderAddParcelToDeliveryAction.raml
+++ b/api-specs/api/types/order/updates/OrderAddParcelToDeliveryAction.raml
@@ -38,3 +38,7 @@ properties:
     type: DeliveryItem[]
     description: |
       Value to set.
+  custom?:
+    type: CustomFieldsDraft
+    description: |
+      Custom Fields for the Parcel.