diff --git a/README.md b/README.md
index 6e33ebb..3ca5e5a 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ If using TypeScript, this package requires TypeScript >= 5.0.
 ```js
 import { generateSecretKey, getPublicKey } from 'nostr-tools'
 
-let sk = generateSecretKey() // `sk` is a hex string
+let sk = generateSecretKey() // `sk` is a Uint8Array
 let pk = getPublicKey(sk) // `pk` is a hex string
 ```