diff --git a/automatic_updates.module b/automatic_updates.module
index c1fa2958f4eb868088b2226dc9d971dd8c2a6269..450dbb3d4e7e9e75f4ec942699e0a4accca9d00e 100644
--- a/automatic_updates.module
+++ b/automatic_updates.module
@@ -281,6 +281,7 @@ function automatic_updates_form_update_settings_alter(array &$form): void {
         ],
       ],
     ],
+    '#description' => t('To use the <code>/system/cron</code> method <a href="http://drupal.org/docs/user_guide/en/security-cron.html">ensure cron is set up correctly</a>.'),
   ];
   $form['#submit'][] = '_automatic_updates_submit_update_settings';
 }
diff --git a/tests/src/FunctionalJavascript/UpdateSettingsFormTest.php b/tests/src/FunctionalJavascript/UpdateSettingsFormTest.php
index 1ed608fefb70b4f4ed4b88cce96e7767c3c3d085..a6b45191d9d67966d11a97729ddd7a46d878398e 100644
--- a/tests/src/FunctionalJavascript/UpdateSettingsFormTest.php
+++ b/tests/src/FunctionalJavascript/UpdateSettingsFormTest.php
@@ -40,6 +40,7 @@ class UpdateSettingsFormTest extends WebDriverTestBase {
     $page = $this->getSession()->getPage();
     $page->selectFieldOption('unattended_level', CronUpdateStage::SECURITY);
     $this->assertNotEmpty($assert_session->waitForElementVisible('named', ['field', 'unattended_method']));
+    $assert_session->elementAttributeContains('named', ['link', 'ensure cron is set up correctly'], 'href', 'http://drupal.org/docs/user_guide/en/security-cron.html');
     // Change the method, to ensure it is properly saved in config.
     $page->selectFieldOption('unattended_method', 'console');