diff --git a/29.md b/29.md
index 9d0dbb5..d342ce7 100644
--- a/29.md
+++ b/29.md
@@ -61,12 +61,17 @@ This is the basic unit of a "microblog" reply note sent to a group.
   "content": "pizza is disgusting and you should be ashamed",
   "tags": [
     ["h", "<group-id>"],
-    [ "e", "<reply-event-id>"],
+    ["e", "<reply-event-id>", "", "root"],
     ["previous", "<event-id>", "<event-id>", ...]
   ]
   ...
 ```
 
+Replies SHOULD use NIP-10 markers, leaving an empty relay url:
+
+* `["e", "<kind-11-root-id>", "", "root"]`
+* `["e", "<kind-12-event-id>", "", "reply"]`
+
 - *chat message* (`kind:9`)
 
 Similar to `kind:11`, this is the basic unit of a chat message sent to a group.