diff --git a/machine.proto b/machine.proto
index fe30812..f356f77 100644
--- a/machine.proto
+++ b/machine.proto
@@ -19,6 +19,7 @@ message Machine {                                       // `autogenpb:marshal`
         Packages                    wit           = 9;  // packages that are available from mirrors.wit.com
         string                      userAgent     = 10;
         string                      uuid          = 11;
+                                                        // func(string)                blah          = 12;
 }
 
 message Machines {                                      // `autogenpb:marshal` `autogenpb:gui`
diff --git a/machine.test.go b/machine.test.go
index 37ccdc8..52f7b56 100644
--- a/machine.test.go
+++ b/machine.test.go
@@ -7,6 +7,14 @@ import (
 	"go.wit.com/log"
 )
 
+func (mt *MachinesTable) lookupWidgetId(id int) {
+	log.Info("no shit. got to lookupWidgdetId() id =", id, "on mt", mt.GetUuid())
+}
+
+func (mt *MachinesTable) Custom(f func(int)) {
+	mt.pb.RegisterCustom(mt.lookupWidgetId)
+}
+
 func (mt *MachinesTable) Delete() {
 	if mt == nil {
 		log.Info("mt == nil table already deleted")