diff --git a/Mailer.php b/Mailer.php
index d19e013..891f2b5 100644
--- a/Mailer.php
+++ b/Mailer.php
@@ -66,6 +66,10 @@ use yii\mail\BaseMailer;
  *
  * @see http://swiftmailer.org
  *
+ * @property array|\Swift_Mailer $swiftMailer Swift mailer instance or array configuration. This property is
+ * read-only.
+ * @property array|\Swift_Transport $transport This property is read-only.
+ *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 2.0
  */
diff --git a/Message.php b/Message.php
index b0ebd63..9558d58 100644
--- a/Message.php
+++ b/Message.php
@@ -16,7 +16,8 @@ use yii\mail\BaseMessage;
  * @see Mailer
  *
  * @method Mailer getMailer() returns mailer instance.
- * @property \Swift_Message $swiftMessage vendor message instance.
+ *
+ * @property \Swift_Message $swiftMessage Swift message instance. This property is read-only.
  *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 2.0