diff --git a/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php b/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
index 7be8e3c..6bb606b 100644
--- a/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
+++ b/core/modules/options/lib/Drupal/options/Tests/OptionsFieldUITest.php
@@ -66,10 +66,10 @@ function testOptionsAllowedValuesInteger() {
     $array = array('0' => 'Zero', '2' => 'Two');
     $this->assertAllowedValuesInput($string, $array, 'Integer keys are accepted.');
 
-    // Check keys if there are leading zeros.
+    // Add keys that have leading zeros and verify that are not stored as strings.
     $string = "00|Zero\n02|Two";
     $array = array('00' => 'Zero', '02' => 'Two');
-    $this->assertAllowedValuesInput($string, $array, 'Integer keys fail if there are leading zeros.');
+    $this->assertAllowedValuesInput($string, $array, 'Keys that have leading zeros are not stored as strings.');
 
     // Check that values can be added and removed.
     $string = "0|Zero\n1|One";
@@ -302,6 +302,8 @@ function assertAllowedValuesInput($input_string, $result, $message) {
     else {
       field_info_cache_clear();
       $field = field_info_field('node', $this->field_name);
+
+      // Keys are stored as integers, so for the key "00" the stored key should be 0.
       if ($this->field_name == 'field_options_integer' && !isset($result[0])) {
         $this->assertNotIdentical($field->getFieldSetting('allowed_values'), $result, $message);
         return;