diff --git a/doc/api/crypto.md b/doc/api/crypto.md
index e7c7c387564719..0cc623dbfac291 100644
--- a/doc/api/crypto.md
+++ b/doc/api/crypto.md
@@ -3857,7 +3857,7 @@ added: v15.0.0
   the maximum HKDF output 16320 bytes).
 * `callback` {Function}
   * `err` {Error}
-  * `derivedKey` {Buffer}
+  * `derivedKey` {ArrayBuffer}
 
 HKDF is a simple key derivation function defined in RFC 5869. The given `ikm`,
 `salt` and `info` are used with the `digest` to derive a key of `keylen` bytes.