diff --git a/ui/tracer/tracer.go b/ui/tracer/tracer.go
index b372885..f19ac18 100644
--- a/ui/tracer/tracer.go
+++ b/ui/tracer/tracer.go
@@ -46,6 +46,8 @@
 	Complete(name string, thread Thread, begin, end uint64)
 
 	ImportNinjaLog(thread Thread, filename string, startOffset time.Time)
+
+	NewThread(name string) Thread
 }
 
 type tracerImpl struct {