diff --git a/core/modules/config/src/Tests/ConfigEntityTest.php b/core/modules/config/src/Tests/ConfigEntityTest.php
index b4ceac2..18263b4 100644
--- a/core/modules/config/src/Tests/ConfigEntityTest.php
+++ b/core/modules/config/src/Tests/ConfigEntityTest.php
@@ -317,8 +317,10 @@ public function testCRUDUI() {
     $this->drupalPostForm('admin/structure/config_test/manage/0/delete', [], 'Delete');
     $this->assertFalse(entity_load('config_test', '0'), 'Test entity deleted');
 
-    // Test the same scenario but it in a non-JS case by using a 'js-hidden'
-    // submit button.
+    // Create a configuration entity with a property that uses AJAX to show
+    // extra form elements. Test this scenario it in a non-JS case by using a
+    // 'js-hidden' submit button.
+    // @see \Drupal\Tests\config\FunctionalJavascript\ConfigEntityTest::testAjaxOnAddPage()
     $this->drupalGet('admin/structure/config_test/add');
 
     $id = strtolower($this->randomMachineName());