diff --git a/libc/kernel/common/linux/cpu.h b/libc/kernel/common/linux/cpu.h
index f7e3889..e91515b 100644
--- a/libc/kernel/common/linux/cpu.h
+++ b/libc/kernel/common/linux/cpu.h
@@ -7,30 +7,37 @@
  ***   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 _LINUX_CPU_H_
 #define _LINUX_CPU_H_
-
 #include <linux/sysdev.h>
 #include <linux/node.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/compiler.h>
 #include <linux/cpumask.h>
 #include <asm/semaphore.h>
-
 struct cpu {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int node_id;
  int no_control;
  struct sys_device sysdev;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct notifier_block;
-
 #define lock_cpu_hotplug() do { } while (0)
 #define unlock_cpu_hotplug() do { } while (0)
 #define lock_cpu_hotplug_interruptible() 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define hotcpu_notifier(fn, pri) do { } while (0)
 #define register_hotcpu_notifier(nb) do { } while (0)
 #define unregister_hotcpu_notifier(nb) do { } while (0)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */