diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTestBase.php b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTestBase.php
index dfde454..7a43f0a 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTestBase.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTestBase.php
@@ -39,7 +39,7 @@
   protected $configName;
 
   /**
-   * Global state for whether the config passed for a name.
+   * Global state for whether the config has a valid schema.
    *
    * @var boolean
    */
@@ -131,7 +131,7 @@ protected function checkValue($key, $value) {
       try {
         $element = $this->schema->get($key);
         if (!$element instanceof ArrayElement) {
-          $this->fail("{$this->configName}:$key is not defined as an array type (eg. mapping or sequence) but is not a scalar value.");
+          $this->fail("Non-scalar {$this->configName}:$key is not defined as an array type (such as mapping or sequence).");
         }
       }
       catch (SchemaIncompleteException $e) {