diff --git a/tests/EventQueueTest.php b/tests/EventQueueTest.php
index 7f25a44..00f31a9 100644
--- a/tests/EventQueueTest.php
+++ b/tests/EventQueueTest.php
@@ -37,11 +37,12 @@ protected function setUp()
 
     /**
      * Tests the queue with IRC events.
+     * $event_params is the same as $params if set to null.
      *
      * @param string $method
      * @param string $command
      * @param array $params
-     * @param array $event_params
+     * @param array|null $event_params
      * @param string|null $prefix
      * @dataProvider dataProviderIrcEvents
      */