diff --git a/core/modules/config/src/Tests/ConfigModifiedTest.php b/core/modules/config/src/Tests/ConfigModifiedTest.php
index fe18757..83ed799 100644
--- a/core/modules/config/src/Tests/ConfigModifiedTest.php
+++ b/core/modules/config/src/Tests/ConfigModifiedTest.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Drupal\config\Tests;
+
 use Drupal\KernelTests\KernelTestBase;
 
 /**
@@ -16,6 +18,9 @@ class ConfigModifiedTest extends KernelTestBase {
    */
   public static $modules = array('config_test', 'system');
 
+  /**
+   * Verify config is not modified, modify it. Verify shows up as modified.
+   */
   public function testIsModified() {
     $this->installConfig(['config_test']);
 
@@ -31,4 +36,4 @@ public function testIsModified() {
 
     $this->assertTrue($manager->isModified($config_name));
   }
-}
\ No newline at end of file
+}