diff --git a/etc/schema.json b/etc/schema.json
index 2de12bf329..017b709c14 100644
--- a/etc/schema.json
+++ b/etc/schema.json
@@ -264,7 +264,7 @@
                             }
                         }
                     },
-                    "additionalProperties": false
+                    "additionalProperties": true
                 },
                 "source": {
                     "type": "object",