diff --git a/libc/kernel/common/linux/mutex.h b/libc/kernel/common/linux/mutex.h
index 4b33a8a..e74c048 100644
--- a/libc/kernel/common/linux/mutex.h
+++ b/libc/kernel/common/linux/mutex.h
@@ -7,40 +7,42 @@
  ***   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_MUTEX_H
 #define __LINUX_MUTEX_H
-
 #include <linux/list.h>
 #include <linux/spinlock_types.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/linkage.h>
 #include <linux/lockdep.h>
-
 #include <asm/atomic.h>
-
 struct mutex {
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  atomic_t count;
  spinlock_t wait_lock;
  struct list_head wait_list;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct mutex_waiter {
  struct list_head list;
  struct task_struct *task;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __DEBUG_MUTEX_INITIALIZER(lockname)
 #define mutex_init(mutex)  do {   static struct lock_class_key __key;     __mutex_init((mutex), #mutex, &__key);  } while (0)
 #define mutex_destroy(mutex) do { } while (0)
-
 #define __DEP_MAP_MUTEX_INITIALIZER(lockname)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __MUTEX_INITIALIZER(lockname)   { .count = ATOMIC_INIT(1)   , .wait_lock = SPIN_LOCK_UNLOCKED   , .wait_list = LIST_HEAD_INIT(lockname.wait_list)   __DEBUG_MUTEX_INITIALIZER(lockname)   __DEP_MAP_MUTEX_INITIALIZER(lockname) }
-
 #define DEFINE_MUTEX(mutexname)   struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
-
 #define mutex_lock_nested(lock, subclass) mutex_lock(lock)
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */