diff --git a/libc/kernel/arch-x86/asm/delay.h b/libc/kernel/arch-x86/asm/delay.h
index 7cb5f74..455455a 100644
--- a/libc/kernel/arch-x86/asm/delay.h
+++ b/libc/kernel/arch-x86/asm/delay.h
@@ -7,13 +7,18 @@
  ***   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_DELAY_H
 #define _ASM_X86_DELAY_H
-
 #define udelay(n) (__builtin_constant_p(n) ?   ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) :   __udelay(n))
-
 #define ndelay(n) (__builtin_constant_p(n) ?   ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) :   __ndelay(n))
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif