diff --git a/gin.go b/gin.go
index 77805c1..1b151ad 100644
--- a/gin.go
+++ b/gin.go
@@ -32,4 +32,5 @@ const (
 	GinOperateModeField        = "operate_mode"         // 操作模式
 	GinClientIpField           = "client_ip"            // 客户端IP
 	GinServerIpField           = "server_ip"            // 服务端IP
+	GinEnvField                = "env"                  // 环境变量
 )