diff --git a/25.md b/25.md
index fa818db..ba4c695 100644
--- a/25.md
+++ b/25.md
@@ -12,6 +12,12 @@ A reaction is a `kind 7` note that is used to react to `kind 1` text notes.
 The generic reaction, represented by an empty string, SHOULD be interpreted as
 a "like".
 
+A reaction with `content` set to `-` SHOULD be interepreted as a "dislike" or
+"downvote". It SHOULD NOT be counted as a "like", and MAY be displayed as a
+downvote or dislike on a post. A client MAY also choose to tally likes against
+dislikes in a reddit-like system of upvotes and downvotes, or display them as
+separate tallys.
+
 The `content` MAY be an emoji, in this case it MAY be interpreted as a "like",
 or the client MAY display this emoji reaction on the post.