diff --git a/libc/kernel/arch-arm/asm/irq.h b/libc/kernel/arch-arm/asm/irq.h
index 2085a21..1522a58 100644
--- a/libc/kernel/arch-arm/asm/irq.h
+++ b/libc/kernel/arch-arm/asm/irq.h
@@ -7,39 +7,43 @@
  ***   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_IRQ_H
 #define __ASM_ARM_IRQ_H
-
 #include <asm/arch/irqs.h>
-
 #ifndef irq_canonicalize
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define irq_canonicalize(i) (i)
 #endif
-
 #ifndef NR_IRQS
 #define NR_IRQS 128
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef NO_IRQ
 #define NO_IRQ ((unsigned int)(-1))
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct irqaction;
-
 #define __IRQT_FALEDGE IRQ_TYPE_EDGE_FALLING
 #define __IRQT_RISEDGE IRQ_TYPE_EDGE_RISING
 #define __IRQT_LOWLVL IRQ_TYPE_LEVEL_LOW
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __IRQT_HIGHLVL IRQ_TYPE_LEVEL_HIGH
-
 #define IRQT_NOEDGE (0)
 #define IRQT_RISING (__IRQT_RISEDGE)
 #define IRQT_FALLING (__IRQT_FALEDGE)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IRQT_BOTHEDGE (__IRQT_RISEDGE|__IRQT_FALEDGE)
 #define IRQT_LOW (__IRQT_LOWLVL)
 #define IRQT_HIGH (__IRQT_HIGHLVL)
 #define IRQT_PROBE IRQ_TYPE_PROBE
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-