diff --git a/.env.example b/.env.example
index de9b1e4..8dbef95 100644
--- a/.env.example
+++ b/.env.example
@@ -4,6 +4,7 @@ APP_KEY=
 APP_DEBUG=false
 APP_TIMEZONE=Asia/Taipei
 APP_URL=http://ctl1.superstar.dnsnet.cc
+BACKEND_URL=https://superstar.dnsnet.cc/
 
 APP_LOCALE=zh-tw
 APP_FALLBACK_LOCALE=zh-tw