diff --git a/openapi.yaml b/openapi.yaml
index 5b8865a1..a23d9d2d 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -2478,7 +2478,9 @@ paths:
         different processing modes (synchronous processing, batch jobs, secondary web services).
 
         The options specified here can be added to the corresponding `POST` requests
-        at the top-level of the object sent in the payload.
+        at the top-level of the object that is sent as the payload.
+        All options SHOULD explicitly be made optional with reasonable defaults
+        as otherwise the interoperability between the implementations decreases.
       tags:
         - Capabilities
         - Data Processing