diff --git a/sb4.sh b/sb4.sh
index 9d6235f..67bcf29 100644
--- a/sb4.sh
+++ b/sb4.sh
@@ -24,7 +24,7 @@ export CFPORT=${CFPORT:-'443'}
 export SUB_TOKEN=${SUB_TOKEN:-${UUID:0:8}}
 export CHAT_ID=${CHAT_ID:-''} 
 export BOT_TOKEN=${BOT_TOKEN:-''}
-export UPLOAD_URL=${UPLOAD_URL:-''} 
+export UPLOAD_URL=${UPLOAD_URL:-''} # 订阅自动上传到Merge-sub汇聚订阅器，示例：https://merge.serv00.net
 
 if [[ "$HOSTNAME" =~ ct8 ]]; then
     CURRENT_DOMAIN="ct8.pl"