diff --git a/README.md b/README.md
index acf86894..e1858a97 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 - [NIP-14: Subject tag in text events.](14.md)
 - [NIP-15: End of Stored Events Notice](15.md)
 - [NIP-16: Event Treatment](16.md)
+- [NIP-22: Event created_at Limits](22.md)
 - [NIP-25: Reactions](25.md)
 
 ## Event Kinds