diff --git a/libc/kernel/arch-x86/asm/e820.h b/libc/kernel/arch-x86/asm/e820.h
index 8a88ff0..08d5af9 100644
--- a/libc/kernel/arch-x86/asm/e820.h
+++ b/libc/kernel/arch-x86/asm/e820.h
@@ -7,30 +7,38 @@
  ***   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_E820_H
 #define __ASM_E820_H
 #define E820MAP 0x2d0  
 #define E820MAX 128  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define E820NR 0x1e8  
-
 #define E820_RAM 1
 #define E820_RESERVED 2
 #define E820_ACPI 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define E820_NVS 4
-
 #ifndef __ASSEMBLY__
 struct e820entry {
  __u64 addr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u64 size;
  __u32 type;
 } __attribute__((packed));
-
 struct e820map {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 nr_map;
  struct e820entry map[E820MAX];
 };
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif