diff --git a/README.md b/README.md
index 80f3d90..9254de4 100644
--- a/README.md
+++ b/README.md
@@ -13,8 +13,9 @@ Using the library is very simple, here is an example of publishing a service ent
 
     // Setup our service export
     host, _ := os.Hostname()
-    info := []string{"My awesome service"},
-    service, _ := NewMDNSService(host, "_foobar._tcp", "", "", 8000, nil, info)
+    instance := fmt.Sprintf("%s:%d", host, 8000)
+    info := []string{"My awesome service"}
+    service, _ := NewMDNSService(instance, "_foobar._tcp", "", "", 8000, nil, info)
 
     // Create the mDNS server, defer shutdown
     server, _ := mdns.NewServer(&mdns.Config{Zone: service})
diff --git a/zone.go b/zone.go
index 6f442c7..7321945 100644
--- a/zone.go
+++ b/zone.go
@@ -23,7 +23,7 @@ type Zone interface {
 
 // MDNSService is used to export a named service by implementing a Zone
 type MDNSService struct {
-	Instance string   // Instance name (e.g. "hostService name")
+	Instance string   // Instance name, must be unique (e.g. "hostName:port")
 	Service  string   // Service name (e.g. "_http._tcp.")
 	Domain   string   // If blank, assumes "local"
 	HostName string   // Host machine DNS name (e.g. "mymachine.net.")