diff --git a/tests/Client/GroupsClientTest.php b/tests/Client/GroupsClientTest.php
index e6f9a1d..b501793 100644
--- a/tests/Client/GroupsClientTest.php
+++ b/tests/Client/GroupsClientTest.php
@@ -46,6 +46,9 @@ public function testBuildApiUrl(string $expected, string $action): void
         $this->assertSame($expected, $client->buildApiUrl());
     }
 
+    /**
+     * @return iterable<array{string, string}>
+     */
     public static function buildApiUrlProvider(): iterable
     {
         yield [