diff --git a/libc/kernel/common/linux/reboot.h b/libc/kernel/common/linux/reboot.h
index e10ff14..c86d81d 100644
--- a/libc/kernel/common/linux/reboot.h
+++ b/libc/kernel/common/linux/reboot.h
@@ -7,24 +7,32 @@
  ***   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_REBOOT_H
 #define _LINUX_REBOOT_H
-
 #define LINUX_REBOOT_MAGIC1 0xfee1dead
 #define LINUX_REBOOT_MAGIC2 672274793
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LINUX_REBOOT_MAGIC2A 85072278
 #define LINUX_REBOOT_MAGIC2B 369367448
 #define LINUX_REBOOT_MAGIC2C 537993216
-
 #define LINUX_REBOOT_CMD_RESTART 0x01234567
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LINUX_REBOOT_CMD_HALT 0xCDEF0123
 #define LINUX_REBOOT_CMD_CAD_ON 0x89ABCDEF
 #define LINUX_REBOOT_CMD_CAD_OFF 0x00000000
 #define LINUX_REBOOT_CMD_POWER_OFF 0x4321FEDC
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LINUX_REBOOT_CMD_RESTART2 0xA1B2C3D4
 #define LINUX_REBOOT_CMD_SW_SUSPEND 0xD000FCE2
 #define LINUX_REBOOT_CMD_KEXEC 0x45584543
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */