diff --git a/libc/kernel/arch-arm/asm/msgbuf.h b/libc/kernel/arch-arm/asm/msgbuf.h
index 84d614c..d687e30 100644
--- a/libc/kernel/arch-arm/asm/msgbuf.h
+++ b/libc/kernel/arch-arm/asm/msgbuf.h
@@ -7,26 +7,35 @@
  ***   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 _ASMARM_MSGBUF_H
 #define _ASMARM_MSGBUF_H
-
 struct msqid64_ds {
  struct ipc64_perm msg_perm;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __kernel_time_t msg_stime;
  unsigned long __unused1;
  __kernel_time_t msg_rtime;
  unsigned long __unused2;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __kernel_time_t msg_ctime;
  unsigned long __unused3;
  unsigned long msg_cbytes;
  unsigned long msg_qnum;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long msg_qbytes;
  __kernel_pid_t msg_lspid;
  __kernel_pid_t msg_lrpid;
  unsigned long __unused4;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned long __unused5;
 };
-
 #endif