diff --git a/etc/example.conf b/etc/example.conf
index b506687f..ab6c44cd 100644
--- a/etc/example.conf
+++ b/etc/example.conf
@@ -59,6 +59,9 @@ listen_port=25
 
 clamd_socket=/tmp/clamd
 
+; smtp timeout. Default: 60 sec
+smtp_timeout=60
+
 helper_timeout=20
 
 ; whether to run external attachment extractors (1) or not (0)