diff --git a/25.md b/25.md
index 7a612a1..86ce763 100644
--- a/25.md
+++ b/25.md
@@ -52,7 +52,7 @@ func make_like_event(pubkey: String, privkey: String, liked: NostrEvent) -> Nost
 Custom Emoji Reaction
 ---------------------
 
-The client may specify a custom emoji ([NIP-30](30.md)) `:shortcode` in the
+The client may specify a custom emoji ([NIP-30](30.md)) `:shortcode:` in the
 reaction content. The client should refer to the emoji tag and render the
 content as an emoji if shortcode is specified.