diff --git a/docs/notifications.md b/docs/notifications.md
index 005193c..5dc6d45 100644
--- a/docs/notifications.md
+++ b/docs/notifications.md
@@ -47,6 +47,7 @@ docker run -d \
   -e WATCHTOWER_NOTIFICATION_EMAIL_FROM=fromaddress@gmail.com \
   -e WATCHTOWER_NOTIFICATION_EMAIL_TO=toaddress@gmail.com \
   -e WATCHTOWER_NOTIFICATION_EMAIL_SERVER=smtp.gmail.com \
+  -e WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=587 \  
   -e WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=fromaddress@gmail.com \
   -e WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=app_password \
   -e WATCHTOWER_NOTIFICATION_EMAIL_DELAY=2 \
@@ -199,4 +200,4 @@ docker run -d \
   -e WATCHTOWER_NOTIFICATION_URL="discord://token@channel slack://watchtower@token-a/token-b/token-c" \
   -e WATCHTOWER_NOTIFICATION_TEMPLATE="{{range .}}{{.Time.Format \"2006-01-02 15:04:05\"}} ({{.Level}}): {{.Message}}{{println}}{{end}}" \
   containrrr/watchtower
-```
\ No newline at end of file
+```