diff --git a/39.md b/39.md
index f5ebe351..b7c3b9c6 100644
--- a/39.md
+++ b/39.md
@@ -12,7 +12,7 @@ Nostr protocol users may have other online identities such as usernames, profile
 
 ## `i` tag on a metadata event
 
-A new optional `i` tag is introduced for `kind 0` metadata event defined in [NIP-01](https://github.com/nostr-protocol/nips/blob/master/01.md):
+A new optional `i` tag is introduced for `kind 0` metadata event defined in [NIP-01](01.md):
 ```json
 {
   "id": <id>,