diff --git a/discovery/Host.go b/discovery/Host.go
index d92d8d0..777a57a 100644
--- a/discovery/Host.go
+++ b/discovery/Host.go
@@ -6,9 +6,10 @@ import (
 )
 
 type Host struct {
-	MetaIPType *meta.MetaIPType `json:"metaIPType,omitempty"`
-	Address    string           `json:"address,omitempty"`
-	Mac        string           `json:"mac,omitempty"`
+	MetaIPType *meta.MetaIPType  `json:"metaIPType,omitempty"`
+	Address    string            `json:"address,omitempty"`
+	Mac        string            `json:"mac,omitempty"`
+	Meta       map[string]string `json:"meta,omitempty"`
 
 	Zone     *Zone   `json:"zone,omitempty"`
 	PortList []*Port `json:"portList,omitempty"`
diff --git a/discovery/Port.go b/discovery/Port.go
index f25df95..379e0b8 100644
--- a/discovery/Port.go
+++ b/discovery/Port.go
@@ -9,9 +9,11 @@ import (
 )
 
 type Port struct {
-	MetaPortType   *meta.MetaPortType `json:"metaPortType,omitempty"`
-	PortNumber     json.Number        `json:"portNumber,omitempty"`
-	DiscoveredDate *util.Timestamp    `json:"discoveredDate,omitempty"`
+	MetaPortType *meta.MetaPortType `json:"metaPortType,omitempty"`
+	PortNumber   json.Number        `json:"portNumber,omitempty"`
+	Meta         map[string]string  `json:"meta,omitempty"`
+
+	DiscoveredDate *util.Timestamp `json:"discoveredDate,omitempty"`
 
 	Host        *Host      `json:"host,omitempty"`
 	ServiceList []*Service `json:"serviceList,omitempty"`
diff --git a/discovery/Service.go b/discovery/Service.go
index c0b03ea..bd3ed9d 100644
--- a/discovery/Service.go
+++ b/discovery/Service.go
@@ -10,6 +10,7 @@ type Service struct {
 	Key            string               `json:"key,omitempty"`
 	Name           string               `json:"name,omitempty"`
 	Description    string               `json:"description,omitempty"`
+	Meta           map[string]string    `json:"meta,omitempty"`
 
 	Port *Port `json:"port,omitempty"`
 
diff --git a/discovery/Zone.go b/discovery/Zone.go
index 4033b18..54fbe0f 100644
--- a/discovery/Zone.go
+++ b/discovery/Zone.go
@@ -8,11 +8,12 @@ import (
 )
 
 type Zone struct {
-	Network    string           `json:"network,omitempty"`
-	Iface      string           `json:"iface,omitempty"`
-	MetaIPType *meta.MetaIPType `json:"metaIPType,omitempty"`
-	Address    string           `json:"address,omitempty"`
-	Mac        string           `json:"mac,omitempty"`
+	Network    string            `json:"network,omitempty"`
+	Iface      string            `json:"iface,omitempty"`
+	MetaIPType *meta.MetaIPType  `json:"metaIPType,omitempty"`
+	Address    string            `json:"address,omitempty"`
+	Mac        string            `json:"mac,omitempty"`
+	Meta       map[string]string `json:"meta,omitempty"`
 
 	DiscoveredDate *util.Timestamp `json:"discoveredDate,omitempty"`