diff --git a/21.md b/21.md
index 5f5e5b7e..800e490d 100644
--- a/21.md
+++ b/21.md
@@ -21,7 +21,7 @@ The identifiers that come after are expected to be the same as those defined in
### Linking HTML pages to Nostr entities
-`` tags with `rel="alternate"` can be used to associate webpages to Nostr events, in cases where the same content is served via the two mediums (for example, a web server that exposes Markdown articles both as HTML pages and as `kind:30023' events served under itself as a relay or through some other relay). For example:
+`` tags with `rel="alternate"` can be used to associate webpages to Nostr events, in cases where the same content is served via the two mediums (for example, a web server that exposes Markdown articles both as HTML pages and as `kind:30023` events served under itself as a relay or through some other relay). For example:
```