diff -u b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
--- b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
+++ b/core/lib/Drupal/Core/Config/Entity/Query/Condition.php
@@ -10,6 +10,11 @@
 use Drupal\Core\Entity\Query\ConditionBase;
 use Drupal\Core\Entity\Query\ConditionInterface;
 
+/**
+ * Defines the condition class for the config entity query.
+ *
+ * @see \Drupal\Core\Config\Entity\Query\Query
+ */
 class Condition extends ConditionBase {
 
   /**
@@ -95,8 +100,9 @@
    *   and the * wildcard.
    * @param array $parents
    *   The current list of parents.
+   *
    * @return bool
-   *   TRUE when matched.
+   *   TRUE when the condition matched to the data else FALSE.
    */
   protected function matchArray($condition, array $data, array $needs_matching, array $parents = array()) {
     $parent = array_shift($needs_matching);
@@ -132,7 +138,7 @@
    * @return bool
    *   TRUE when matches.
    */
-  function match($condition, $value) {
+  protected function match($condition, $value) {
     if (isset($value)) {
       switch ($condition['operator']) {
         case '=':
diff -u b/core/modules/system/lib/Drupal/system/Tests/Entity/ConfigEntityQueryTest.php b/core/modules/system/lib/Drupal/system/Tests/Entity/ConfigEntityQueryTest.php
--- b/core/modules/system/lib/Drupal/system/Tests/Entity/ConfigEntityQueryTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Entity/ConfigEntityQueryTest.php
@@ -407,7 +407,7 @@
   /**
    * Test dotted path matching.
    */
-  function testDotted() {
+  protected function testDotted() {
     $this->queryResults = $this->factory->get('config_query_test')
       ->condition('array.level1.*', 1)
       ->execute();
@@ -432,11 +432,10 @@
    * @param array $expected
    *   Array of expected entity IDs.
    */
-  function assertResults($expected) {
+  protected function assertResults($expected) {
     $this->assertIdentical(count($this->queryResults), count($expected));
     foreach ($expected as $value) {
-      // This also tests whether $this->queryResults[$value] is even set at
-      // all.
+      // This also tests whether $this->queryResults[$value] is even set at all.
       $this->assertIdentical($this->queryResults[$value], $value);
     }
   }