diff --git a/C7.md b/C7.md
index 0d94f18b..5d28d543 100644
--- a/C7.md
+++ b/C7.md
@@ -27,3 +27,5 @@ A reply to a `kind 9` is an additional `kind 9` which quotes the parent using a
   ]
 }
 ```
+
+Clients that render a "chat view" as a stream of ordered events MUST only fetch `kind 9` events in order to prevent missing context across implementations. Other content types MAY be quoted within in a `kind 9` following [NIP 18](./18.md).