diff --git a/smtp.php b/smtp.php
index 2b69a7c..fede61e 100644
--- a/smtp.php
+++ b/smtp.php
@@ -140,7 +140,7 @@ class smtp
     * @param string $from The email address used for the from enveloppe
     * @param string|array $to the recipient of the email. Not displayed in the
     *        email content
-    * @param $completeMail The content of the email
+    * @param string $completeMail The content of the email
     * @return the message from the server (where is stored the message queue
     * identifier
     */