diff --git a/design.org b/design.org
index 3089fc0..75a018d 100644
--- a/design.org
+++ b/design.org
@@ -1,4 +1,6 @@
 # Copyright (C) 2018 Jan Malakhovski
+# Copyright (C) 2018 Lance R. Vick
+
 # Permission is granted to copy, distribute and/or modify this document
 # under the terms of the GNU Free Documentation License, Version 1.3
 # or any later version published by the Free Software Foundation;
@@ -163,6 +165,12 @@ of other reviewers
 - "+" = "I approve".
 
 "priority": self-explanatory.
+# Copyright (C) 2018 Leo Gaspard
+
+Tools that desire to add additional metadata MUST place it under the'vendor'
+key which is reserved for this purpouse. Tools SHOULD use a subkey under
+'vendor' key named the same as the tool. The default verification command in a
+tool MUST NOT interpret data under the 'vendor' key.
 
 ** Examples