Adding disclaimer that notifications require HTTPS in some browsers

modules/private_message_nodejs/src/Plugin/PrivateMessageConfigForm/PrivateMessageNodeJsPrivateMessageConfigForm.php

@@ -116,7 +116,7 @@ class PrivateMessageNodeJsPrivateMessageConfigForm extends PrivateMessageConfigF
     $form['browser_push_notifications']['browser_notification_settings_wrapper']['header'] = [
       '#prefix' => '<p><i>',
       '#suffix' => '</i></p>',
-      '#markup' => $this->t('Enter the notification details below. You can use tokens in these fields'),
+      '#markup' => $this->t('Enter the notification details below. You can use tokens in these fields. Note that some browsers require HTTPS (SSL) and will not work on HTTP.'),
     ];
 
     $form['browser_push_notifications']['browser_notification_settings_wrapper']['browser_notification_title'] = [