diff --git a/iterator.go b/iterator.go
index cc33c86..2a9e215 100644
--- a/iterator.go
+++ b/iterator.go
@@ -27,6 +27,7 @@ const (
 
 type Iterator interface {
 	Typer
+	fmt.Stringer
 	Next() (item any, err error) // must return io.EOF after the last item
 	Current() (item any, err error)
 	Index() int