diff --git a/libc/kernel/common/asm-generic/local.h b/libc/kernel/common/asm-generic/local.h
index cae0d54..c673bdf 100644
--- a/libc/kernel/common/asm-generic/local.h
+++ b/libc/kernel/common/asm-generic/local.h
@@ -7,45 +7,52 @@
  ***   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_GENERIC_LOCAL_H
 #define _ASM_GENERIC_LOCAL_H
-
 #include <linux/percpu.h>
 #include <linux/hardirq.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/atomic.h>
 #include <asm/types.h>
-
 typedef struct
 {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  atomic_long_t a;
 } local_t;
-
 #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
-
 #define local_read(l) atomic_long_read(&(l)->a)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define local_set(l,i) atomic_long_set((&(l)->a),(i))
 #define local_inc(l) atomic_long_inc(&(l)->a)
 #define local_dec(l) atomic_long_dec(&(l)->a)
 #define local_add(i,l) atomic_long_add((i),(&(l)->a))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
-
 #define __local_inc(l) local_set((l), local_read(l) + 1)
 #define __local_dec(l) local_set((l), local_read(l) - 1)
 #define __local_add(i,l) local_set((l), local_read(l) + (i))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __local_sub(i,l) local_set((l), local_read(l) - (i))
-
 #define cpu_local_read(v) local_read(&__get_cpu_var(v))
 #define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
 #define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
 #define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
 #define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
-
 #define __cpu_local_inc(v) __local_inc(&__get_cpu_var(v))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __cpu_local_dec(v) __local_dec(&__get_cpu_var(v))
 #define __cpu_local_add(i, v) __local_add((i), &__get_cpu_var(v))
 #define __cpu_local_sub(i, v) __local_sub((i), &__get_cpu_var(v))
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */