diff --git a/libc/kernel/arch-arm/asm/smp.h b/libc/kernel/arch-arm/asm/smp.h
index e6c1e41..88cd1b7 100644
--- a/libc/kernel/arch-arm/asm/smp.h
+++ b/libc/kernel/arch-arm/asm/smp.h
@@ -7,28 +7,30 @@
  ***   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_ARM_SMP_H
 #define __ASM_ARM_SMP_H
-
 #include <linux/threads.h>
 #include <linux/cpumask.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/thread_info.h>
-
 #include <asm/arch/smp.h>
-
 #error "<asm-arm/smp.h> included in non-SMP build"
-
 #define raw_smp_processor_id() (current_thread_info()->cpu)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PROC_CHANGE_PENALTY 15
-
 struct seq_file;
-
 struct secondary_data {
  unsigned long pgdir;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  void *stack;
 };
-
 #endif