diff --git a/lib/Cake/Console/Command/TestShell.php b/lib/Cake/Console/Command/TestShell.php
index 6d991d930b2..b5f4abb0628 100644
--- a/lib/Cake/Console/Command/TestShell.php
+++ b/lib/Cake/Console/Command/TestShell.php
@@ -47,6 +47,9 @@ public function getOptionParser() {
 		$parser = new ConsoleOptionParser($this->name);
 		$parser->description(array(
 			__d('cake_console', 'The CakePHP Testsuite allows you to run test cases from the command line'),
+		))->addArgument('category', array(
+			'help' => __d('cake_console', 'The category for the test, or test file, to test.'),
+			'required' => false,
 		))->addArgument('file', array(
 			'help' => __d('cake_console', 'The path to the file, or test file, to test.'),
 			'required' => false,