diff --git a/README.md b/README.md
index 38fd6c7..3b8b5e7 100644
--- a/README.md
+++ b/README.md
@@ -266,6 +266,8 @@ $ sudo chmod 755 /etc/rc.local
 $ update-rc.d rc.local defaults
 $ sudo systemctl start orbit
 $ sudo systemctl start rc.local
+$ sudo systemctl enable mongod.service #ubuntu18.04以上適用(可在系統boot時，自動開啟mongo)
+$ sudo mv /etc/init.d/mongod /etc/systemd/system/ && sudo systemctl enable mongod.service #如果sudo systemctl enable mongod.service失敗時
 $ sudo crontab -e #加入以下內容
 # @reboot /etc/init.d/orbit start
 # @reboot service mongod restart