diff --git a/.env.example b/.env.example
index 4f5fb79c..32e437e5 100644
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,7 @@
 DOCKER_DEFAULT_PLATFORM=linux/amd64
 COMPOSE_PROJECT_NAME=3x
 BUILD_WITH_ANTIZAPRET="0"
+HOSTNAME="3x-ui"
 XUI_SERVER_IP=""
 XUI_PANEL_DOMAIN=""
 XUI_SUB_DOMAIN=""