diff --git a/25.md b/25.md
index 86ce763..63c07a7 100644
--- a/25.md
+++ b/25.md
@@ -19,7 +19,8 @@ dislikes in a reddit-like system of upvotes and downvotes, or display them as
 separate tallies.
 
 The `content` MAY be an emoji, or [NIP-30](30.md) custom emoji in this case it MAY be interpreted as a "like" or "dislike",
-or the client MAY display this emoji reaction on the post.
+or the client MAY display this emoji reaction on the post. If the `content` is an empty string then the client should
+consider it a "+".
 
 Tags
 ----