1 files changed, 5 insertions, 0 deletions

diff --git a/opcode.h b/opcode.h
index 80506b3e33..5f4acf5517 100644
--- a/opcode.h
+++ b/opcode.h
@@ -1,3 +1,8 @@
+/* !!!!!!!   DO NOT EDIT THIS FILE   !!!!!!! 
+   This file is built by opcode.pl from its data.  Any changes made here
+   will be lost!
+*/
+
 #define Perl_pp_i_preinc Perl_pp_preinc
 #define Perl_pp_i_predec Perl_pp_predec
 #define Perl_pp_i_postinc Perl_pp_postinc