diff --git a/schemas/data-ingress/message-envelope.json b/schemas/data-ingress/message-envelope.json
index eafd127..e6da4f2 100644
--- a/schemas/data-ingress/message-envelope.json
+++ b/schemas/data-ingress/message-envelope.json
@@ -28,6 +28,6 @@
         },
         "payload": {}
     },
-    "required": ["service_name", "service_id", "data_type", "sent_timestamp"],
+    "required": ["service_name", "service_id", "data_type", "data_kind", "sent_timestamp"],
     "additionalProperties": false
 }
\ No newline at end of file