diff --git a/core/tests/Drupal/TestSite/TestSetupInterface.php b/core/tests/Drupal/TestSite/TestSetupInterface.php
index 359f4446b6..f305c3f61a 100644
--- a/core/tests/Drupal/TestSite/TestSetupInterface.php
+++ b/core/tests/Drupal/TestSite/TestSetupInterface.php
@@ -3,7 +3,9 @@
 namespace Drupal\TestSite;
 
 /**
- * Allows you to setup an environment used for javascript tests.
+ * Allows you to setup an environment as part of a test site install.
+ *
+ * @see \Drupal\TestSite\TestSiteApplication
  */
 interface TestSetupInterface {