diff --git a/discovery/Host.go b/discovery/Host.go
index 4322c52..566e3fa 100644
--- a/discovery/Host.go
+++ b/discovery/Host.go
@@ -15,5 +15,6 @@ type Host struct {
 	Zone     *Zone   `json:"zone,omitempty"`
 	PortList []*Port `json:"portList,omitempty"`
 
+	DiscoveredBy   string          `json:"discoveredBy,omitempty"`
 	DiscoveredDate *util.Timestamp `json:"discoveredDate,omitempty"`
 }
diff --git a/discovery/Port.go b/discovery/Port.go
index 379e0b8..01121b1 100644
--- a/discovery/Port.go
+++ b/discovery/Port.go
@@ -13,10 +13,10 @@ type Port struct {
 	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"`
 
-	UDPLayer gopacket.Layer `json:"-"`
+	DiscoveredBy   string          `json:"discoveredBy,omitempty"`
+	DiscoveredDate *util.Timestamp `json:"discoveredDate,omitempty"`
+	UDPLayer       gopacket.Layer  `json:"-"`
 }
diff --git a/discovery/Service.go b/discovery/Service.go
index bd3ed9d..f7a6b7e 100644
--- a/discovery/Service.go
+++ b/discovery/Service.go
@@ -14,6 +14,7 @@ type Service struct {
 
 	Port *Port `json:"port,omitempty"`
 
+	DiscoveredBy   string            `json:"discoveredBy,omitempty"`
 	DiscoveredDate *util.Timestamp   `json:"discoveredDate,omitempty"`
 	Metadata       map[string]string `json:"metadata,omitempty"`
 }
diff --git a/discovery/Zone.go b/discovery/Zone.go
index 54fbe0f..d637f91 100644
--- a/discovery/Zone.go
+++ b/discovery/Zone.go
@@ -15,6 +15,7 @@ type Zone struct {
 	Mac        string            `json:"mac,omitempty"`
 	Meta       map[string]string `json:"meta,omitempty"`
 
+	DiscoveredBy   string          `json:"discoveredBy,omitempty"`
 	DiscoveredDate *util.Timestamp `json:"discoveredDate,omitempty"`
 
 	mtx sync.RWMutex `json:"-"`