diff --git a/21.md b/21.md
index 39a4e1d4..5f5e5b7e 100644
--- a/21.md
+++ b/21.md
@@ -29,7 +29,7 @@ The identifiers that come after are expected to be the same as those defined in
```
-Likewise, `` tags with `rel="me"` can be used to assign authorship of webpages to Nostr profiles. For example:
+Likewise, `` tags with `rel="me"` or `rel="author"` can be used to assign authorship of webpages to Nostr profiles. For example:
```