diff --git a/88.md b/88.md
index 985db5e..b68bd66 100644
--- a/88.md
+++ b/88.md
@@ -14,7 +14,7 @@ Nostr Cash is entirely custodial and trust based, and is just a common standard
 
 Relays offering mints must have a keypair and an additional nostr keypair for its mint.
 
-Nostr Cash uses derived keys, much like [NIP26](https://github.com/nostr-protocol/nips/blob/master/26.md). Each "cash" is actually just a derived private key that can be burned or passed to another user.
+Nostr Cash uses derived keys, much like [NIP06](https://github.com/nostr-protocol/nips/blob/master/06.md). Each "cash" is actually just a derived private key that can be burned or passed to another user.
 
 All communication between the relay and user happen over [NIP04](https://github.com/nostr-protocol/nips/blob/master/04.md).