diff --git a/libc/kernel/arch-arm/asm/a.out.h b/libc/kernel/arch-arm/asm/a.out.h
index e8f17dc..73977ec 100644
--- a/libc/kernel/arch-arm/asm/a.out.h
+++ b/libc/kernel/arch-arm/asm/a.out.h
@@ -7,36 +7,42 @@
  ***   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 __ARM_A_OUT_H__
 #define __ARM_A_OUT_H__
-
 #include <linux/personality.h>
 #include <asm/types.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct exec
 {
  __u32 a_info;
  __u32 a_text;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 a_data;
  __u32 a_bss;
  __u32 a_syms;
  __u32 a_entry;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 a_trsize;
  __u32 a_drsize;
 };
-
 #define N_TXTADDR(a) (0x00008000)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define N_TRSIZE(a) ((a).a_trsize)
 #define N_DRSIZE(a) ((a).a_drsize)
 #define N_SYMSIZE(a) ((a).a_syms)
-
 #define M_ARM 103
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef LIBRARY_START_TEXT
 #define LIBRARY_START_TEXT (0x00c00000)
 #endif
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */