diff --git a/tests/phpunit/includes/testcase.php b/tests/phpunit/includes/testcase.php
index 27aabbf906..6c893cef49 100644
--- a/tests/phpunit/includes/testcase.php
+++ b/tests/phpunit/includes/testcase.php
@@ -412,6 +412,11 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		$this->assertEquals( $expected, $actual );
 	}
 
+	/**
+	 * Modify WordPress's query internals as if a given URL has been requested.
+	 *
+	 * @param string $url The URL for the request.
+	 */
 	function go_to( $url ) {
 		// note: the WP and WP_Query classes like to silently fetch parameters
 		// from all over the place (globals, GET, etc), which makes it tricky