diff --git a/libc/kernel/common/linux/genhd.h b/libc/kernel/common/linux/genhd.h
index a3a3924..e7326d4 100644
--- a/libc/kernel/common/linux/genhd.h
+++ b/libc/kernel/common/linux/genhd.h
@@ -7,49 +7,55 @@
  ***   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_GENHD_H
 #define _LINUX_GENHD_H
-
 #include <linux/types.h>
-
 enum {
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DOS_EXTENDED_PARTITION = 5,
  LINUX_EXTENDED_PARTITION = 0x85,
  WIN98_EXTENDED_PARTITION = 0x0f,
-
  LINUX_SWAP_PARTITION = 0x82,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  LINUX_RAID_PARTITION = 0xfd,
-
  SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
  NEW_SOLARIS_X86_PARTITION = 0xbf,
-
  DM6_AUX1PARTITION = 0x51,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DM6_AUX3PARTITION = 0x53,
  DM6_PARTITION = 0x54,
  EZD_PARTITION = 0x55,
-
  FREEBSD_PARTITION = 0xa5,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  OPENBSD_PARTITION = 0xa6,
  NETBSD_PARTITION = 0xa9,
  BSDI_PARTITION = 0xb7,
  MINIX_PARTITION = 0x81,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  UNIXWARE_PARTITION = 0x63,
 };
-
 struct partition {
  unsigned char boot_ind;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned char head;
  unsigned char sector;
  unsigned char cyl;
  unsigned char sys_ind;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned char end_head;
  unsigned char end_sector;
  unsigned char end_cyl;
  unsigned int start_sect;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned int nr_sects;
 } __attribute__((packed));
-
 #endif