diff --git a/src/v1/openapi.yaml b/src/v1/openapi.yaml
index a4849cd..b445106 100644
--- a/src/v1/openapi.yaml
+++ b/src/v1/openapi.yaml
@@ -331,6 +331,13 @@ paths:
       - "Customers"
       parameters:
       - $ref: "#/components/parameters/ResponseResolutionDepthParameter"
+      - name: "EMailAddressShouldBeUsedToCreateADefaultDocumentDespatch"
+        in: "query"
+        required: false
+        description: "The default - as in our ERP program TyrePro - is: NonCashReceiptDealsOnly, Invoices, CreditNotes and CustomerStorages will get delivered by E-Mail as normal PDF."
+        schema:
+          type: "boolean"
+          default: false
       requestBody:
         required: true
         content: