diff --git a/src/Form/ContactStorageSettingsForm.php b/src/Form/ContactStorageSettingsForm.php
index 5f42b1c..112ee88 100644
--- a/src/Form/ContactStorageSettingsForm.php
+++ b/src/Form/ContactStorageSettingsForm.php
@@ -36,7 +36,7 @@ class ContactStorageSettingsForm extends ConfigFormBase {
     $form['send_html'] = array(
       '#type' => 'checkbox',
       '#title' => t('Send HTML'),
-      '#description' => t('Whether the mails should be sent as HTML. A module like <a href=\'https://www.drupal.org/project/swiftmailer\'>Swiftmailer</a> is needed for this feature.'),
+      '#description' => t('Whether the mails should be sent as HTML. A module like <a href=\'https://www.drupal.org/project/swiftmailer\'>Swiftmailer</a> is needed for this feature. This has only been tested with the Swiftmailer module, other modules might not work out of the box and will not use the provided default template.'),
       '#default_value' => $config->get('send_html'),
     );