diff --git a/libc/kernel/arch-x86/asm/shmbuf.h b/libc/kernel/arch-x86/asm/shmbuf.h
index 314ccb7..81cce3e 100644
--- a/libc/kernel/arch-x86/asm/shmbuf.h
+++ b/libc/kernel/arch-x86/asm/shmbuf.h
@@ -7,43 +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 _ASM_X86_SHMBUF_H
 #define _ASM_X86_SHMBUF_H
-
 struct shmid64_ds {
  struct ipc64_perm shm_perm;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  size_t shm_segsz;
  __kernel_time_t shm_atime;
 #ifdef __i386__
  unsigned long __unused1;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
  __kernel_time_t shm_dtime;
 #ifdef __i386__
  unsigned long __unused2;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
  __kernel_time_t shm_ctime;
 #ifdef __i386__
  unsigned long __unused3;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
  __kernel_pid_t shm_cpid;
  __kernel_pid_t shm_lpid;
  unsigned long shm_nattch;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused4;
  unsigned long __unused5;
 };
-
 struct shminfo64 {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long shmmax;
  unsigned long shmmin;
  unsigned long shmmni;
  unsigned long shmseg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long shmall;
  unsigned long __unused1;
  unsigned long __unused2;
  unsigned long __unused3;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused4;
 };
-
 #endif