diff --git a/taskflow.go b/taskflow.go
index 28556e3..40866b0 100644
--- a/taskflow.go
+++ b/taskflow.go
@@ -65,6 +65,7 @@ func (tf *TaskFlow) NewCondition(name string, predict func() uint) *Task {
 	return task
 }
 
+// Dump writes graph dot data into writer
 func (tf *TaskFlow) Dump(writer io.Writer) error {
 	return visualize(tf, writer)
 }