diff --git a/tool/mk_call_iseq_optimized.rb b/tool/mk_call_iseq_optimized.rb
index f04917cceb..d6b21dccec 100644
--- a/tool/mk_call_iseq_optimized.rb
+++ b/tool/mk_call_iseq_optimized.rb
@@ -4,7 +4,7 @@ puts <<EOS
 
 /* DO NOT EDIT THIS FILE DIRECTLY
  *
- * This file is generated by tool/mkcall_iseq.rb
+ * This file is generated by tool/mk_call_iseq_optimized.rb
  */
 
 EOS