diff --git mailcomment.module mailcomment.module
index cf685c0..0f445b9 100644
--- mailcomment.module
+++ mailcomment.module
@@ -54,7 +54,7 @@ function mailcomment_admin_settings() {
     '#title' => t('Reply-To address'),
     '#type' => 'textfield',
     '#default_value' => variable_get('mailcomment_mailbox', variable_get('site_mail', '')),
-    '#description' => t('E-mail account used to set Reply-To for outgoing e-mail notifications.'),
+    '#description' => t('E-mail account used to set Reply-To for outgoing e-mail notifications. Required format: <em>NAME @email</em> Name is optional, but be sure to separate the name from the email with a space if you include it.', array('@email' => '<mailbox@example.com>')),
   );
   // Expiration time
   $period = drupal_map_assoc(array(60, 3600, 10800, 21600, 32400, 43200, 86400, 172800, 259200, 604800, 1209600, 2419200), 'format_interval');