diff --git a/21.md b/21.md
index bfbb3ae5..6246eb49 100644
--- a/21.md
+++ b/21.md
@@ -1,12 +1,12 @@
 NIP-21
 ======
 
-`nostr:` URL scheme
+`nostr:` URI scheme
 -------------------
 
 `draft` `optional` `author:fiatjaf`
 
-This NIP standardizes the usage of a common URL scheme for maximum interoperability and openness in the network.
+This NIP standardizes the usage of a common URI scheme for maximum interoperability and openness in the network.
 
 The scheme is `nostr:`.