diff --git a/doc/lightning-sendcustommsg.7.md b/doc/lightning-sendcustommsg.7.md
index 90966d78a..10e15a604 100644
--- a/doc/lightning-sendcustommsg.7.md
+++ b/doc/lightning-sendcustommsg.7.md
@@ -69,4 +69,4 @@ RESOURCES
 
 Main web site: <https://github.com/ElementsProject/lightning>
 
-[comment]: # ( SHA256STAMP:5e21c81225dce83b231d8625e0da8e1fedc17a3b76c0109b6e84bae4a4422905)
+[comment]: # ( SHA256STAMP:fded86dbe217eacf0c170db87140fd5f10f23c22760ac08b7aa4d2faa4764b3a)
diff --git a/doc/schemas/sendcustommsg.schema.json b/doc/schemas/sendcustommsg.schema.json
index cc61e6190..3c9db46a3 100644
--- a/doc/schemas/sendcustommsg.schema.json
+++ b/doc/schemas/sendcustommsg.schema.json
@@ -1,6 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "type": "object",
+  "additionalProperties": false,
   "required": [
     "status"
   ],