diff --git a/libc/kernel/common/linux/tiocl.h b/libc/kernel/common/linux/tiocl.h
index db15a8d..2caa18c 100644
--- a/libc/kernel/common/linux/tiocl.h
+++ b/libc/kernel/common/linux/tiocl.h
@@ -7,41 +7,49 @@
  ***   structures, and macros generated from the original header, and thus,
  ***   contains no copyrightable information.
  ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #ifndef _LINUX_TIOCL_H
 #define _LINUX_TIOCL_H
-
 #define TIOCL_SETSEL 2  
 #define TIOCL_SELCHAR 0  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCL_SELWORD 1  
 #define TIOCL_SELLINE 2  
 #define TIOCL_SELPOINTER 3  
 #define TIOCL_SELCLEAR 4  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCL_SELMOUSEREPORT 16  
 #define TIOCL_SELBUTTONMASK 15  
-
 struct tiocl_selection {
  unsigned short xs;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned short ys;
  unsigned short xe;
  unsigned short ye;
  unsigned short sel_mode;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 #define TIOCL_PASTESEL 3  
 #define TIOCL_UNBLANKSCREEN 4  
-
 #define TIOCL_SELLOADLUT 5
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCL_GETSHIFTSTATE 6  
 #define TIOCL_GETMOUSEREPORTING 7  
 #define TIOCL_SETVESABLANK 10  
 #define TIOCL_SETKMSGREDIRECT 11  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCL_GETFGCONSOLE 12  
 #define TIOCL_SCROLLCONSOLE 13  
 #define TIOCL_BLANKSCREEN 14  
 #define TIOCL_BLANKEDSCREEN 15  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCL_GETKMSGREDIRECT 17  
-
 #endif