diff --git a/Setup-Computer-IOC-Server.md b/Setup-Computer-IOC-Server.md
index 142b96e..f431db0 100644
--- a/Setup-Computer-IOC-Server.md
+++ b/Setup-Computer-IOC-Server.md
@@ -107,6 +107,7 @@ sudo make modules_install install
 sudo depmod -a
 
 sudo cp ~/work/stxm/IOCServer/99-EtherCAT.rules  /etc/udev/rules.d/
+sudo cp ~/work/stxm/IOCServer/ethercat.conf /usr/local/etc/ ## chage MAC address
 
 
 ```