diff --git a/src/Core/OAuth2Provider.php b/src/Core/OAuth2Provider.php
index 3672211b..f08b38dd 100644
--- a/src/Core/OAuth2Provider.php
+++ b/src/Core/OAuth2Provider.php
@@ -41,7 +41,7 @@ abstract class OAuth2Provider extends OAuthProvider implements OAuth2Interface{
 
 	/**
 	 * @inheritDoc
-	 * @param string[] $scopes
+	 * @param string[]|null $scopes
 	 */
 	public function getAuthURL(array|null $params = null, array|null $scopes = null):UriInterface{
 		$params ??= [];
@@ -165,7 +165,7 @@ public function getRequestAuthorization(RequestInterface $request, AccessToken $
 	}
 
 	/**
-	 * @param string[] $scopes
+	 * @param string[]|null $scopes
 	 * @implements \chillerlan\OAuth\Core\ClientCredentials
 	 * @throws \chillerlan\OAuth\Providers\ProviderException
 	 */