diff --git a/cmd/struct.go b/cmd/struct.go
index f28923b..762a703 100644
--- a/cmd/struct.go
+++ b/cmd/struct.go
@@ -98,8 +98,10 @@ type JailConfig struct {
 	Host_time             int    `json:"host_time"`
 	Hostid                string `json:"hostid"`
 	Hostid_strict_check   int    `json:"hostid_strict_check"`
+// Specify multiple net cards with "vnet0:bridge0,vnet1:bridge1"
 	Interfaces            string `json:"interfaces"`
 	Ip4                   string `json:"ip4"`
+// Specify multiples IP with "vnet0|192.168.1.42,vnet1|10.0.0.3"
 	Ip4_addr              string `json:"ip4_addr"`
 	Ip4_saddrsel          string `json:"ip4_saddrsel"`
 	Ip6                   string `json:"ip6"`