diff --git a/25.md b/25.md
index bdee066..7cc96b5 100644
--- a/25.md
+++ b/25.md
@@ -25,12 +25,15 @@ consider it a "+".
 Tags
 ----
 
-The reaction event SHOULD include `e` and `p` tags pointing to the note the user is
+The reaction event SHOULD include `a`, `e` and `p` tags pointing to the note the user is
 reacting to. The `p` tag allows authors to be notified. The `e` tags enables clients 
-to pull all the reactions to individual posts.
+to pull all the reactions to individual events and `a` tags enables clients to seek reactions
+for all versions of a replaceable event. 
 
 The `e` tag MUST be the `id` of the note that is being reacted to. 
 
+The `a` tag MUST contain the coordinates (`kind:pubkey:d-tag`) of the replaceable being reacted to. 
+
 The `p` tag MUST be the `pubkey` of the event being reacted to.
 
 The reaction event MAY include a `k` tag with the stringified kind number