diff --git a/operator-builtin.go b/operator-builtin.go
index b881192..4d29488 100644
--- a/operator-builtin.go
+++ b/operator-builtin.go
@@ -1,7 +1,7 @@
 // Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
 // All rights reserved.
 
-// operator-length.go
+// operator-builtin.go
 package expr
 
 //-------- builtin term