diff --git a/core/modules/system/lib/Drupal/system/Tests/Session/SessionHttpsTest.php b/core/modules/system/lib/Drupal/system/Tests/Session/SessionHttpsTest.php
index f1779f4..18bd3bb 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Session/SessionHttpsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Session/SessionHttpsTest.php
@@ -13,7 +13,7 @@
 use Drupal\Component\Utility\String;
 
 /**
- * Ensure that when running under HTTPS two session cookies are generated.
+ * Tests that when running under HTTPS two session cookies are generated.
  */
 class SessionHttpsTest extends WebTestBase {
 
@@ -276,7 +276,7 @@ protected function testCsrfTokenWithMixedModeSsl() {
   }
 
   /**
-   * Return the token of the current form.
+   * Returns the token of the current form.
    */
   protected function getFormToken() {
     $token_fields = $this->xpath('//input[@name="form_token"]');
diff --git a/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/Form/SessionTestForm.php b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/Form/SessionTestForm.php
index f67ba1f..e611b1e 100644
--- a/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/Form/SessionTestForm.php
+++ b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/Form/SessionTestForm.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\session_test\Form\SessionTestForm
+ * Contains \Drupal\session_test\Form\SessionTestForm.
  */
 
 namespace Drupal\session_test\Form;
@@ -11,7 +11,9 @@
 use Drupal\Core\Form\FormBase;
 
 /**
- * Form controller for the test config edit forms.
+ * Provides a form that can be submitted, to test session tokens.
+ *
+ * @see \Drupal\system\Tests\Session\SessionHttpsTest::testCsrfTokenWithMixedModeSsl()
  */
 class SessionTestForm extends FormBase {