diff --git a/libc/kernel/arch-arm/asm/hardirq.h b/libc/kernel/arch-arm/asm/hardirq.h
index 54207e3..db06a9a 100644
--- a/libc/kernel/arch-arm/asm/hardirq.h
+++ b/libc/kernel/arch-arm/asm/hardirq.h
@@ -7,32 +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 __ASM_HARDIRQ_H
 #define __ASM_HARDIRQ_H
-
 #include <linux/cache.h>
 #include <linux/threads.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/irq.h>
-
 typedef struct {
  unsigned int __softirq_pending;
  unsigned int local_timer_irqs;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 } ____cacheline_aligned irq_cpustat_t;
-
 #include <linux/irq_cpustat.h>  
-
 #if NR_IRQS > 256
 #define HARDIRQ_BITS 9
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 #define HARDIRQ_BITS 8
 #endif
-
 #if 1 << HARDIRQ_BITS < NR_IRQS
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #error HARDIRQ_BITS is too low!
 #endif
-
 #define __ARCH_IRQ_EXIT_IRQS_DISABLED 1
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */