diff --git a/core/modules/system/tests/modules/session_exists_cache_context_test/session_exists_cache_context_test.module b/core/modules/system/tests/modules/session_exists_cache_context_test/session_exists_cache_context_test.module
index b4179c0..60d2452 100644
--- a/core/modules/system/tests/modules/session_exists_cache_context_test/session_exists_cache_context_test.module
+++ b/core/modules/system/tests/modules/session_exists_cache_context_test/session_exists_cache_context_test.module
@@ -1,6 +1,11 @@
 <?php
 
 /**
+ * @file
+ * Test module.
+ */
+
+/**
  * Implements hook_page_top().
  */
 function session_exists_cache_context_test_page_top(array &$page_top) {