diff --git a/libc/kernel/arch-arm/asm/signal.h b/libc/kernel/arch-arm/asm/signal.h
index 212d9f1..94713b9 100644
--- a/libc/kernel/arch-arm/asm/signal.h
+++ b/libc/kernel/arch-arm/asm/signal.h
@@ -7,97 +7,107 @@
  ***   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 _ASMARM_SIGNAL_H
 #define _ASMARM_SIGNAL_H
-
 #include <linux/types.h>
-
 struct siginfo;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NSIG 32
 typedef unsigned long sigset_t;
-
 #define SIGHUP 1
 #define SIGINT 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGQUIT 3
 #define SIGILL 4
 #define SIGTRAP 5
 #define SIGABRT 6
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGIOT 6
 #define SIGBUS 7
 #define SIGFPE 8
 #define SIGKILL 9
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGUSR1 10
 #define SIGSEGV 11
 #define SIGUSR2 12
 #define SIGPIPE 13
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGALRM 14
 #define SIGTERM 15
 #define SIGSTKFLT 16
 #define SIGCHLD 17
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGCONT 18
 #define SIGSTOP 19
 #define SIGTSTP 20
 #define SIGTTIN 21
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGTTOU 22
 #define SIGURG 23
 #define SIGXCPU 24
 #define SIGXFSZ 25
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGVTALRM 26
 #define SIGPROF 27
 #define SIGWINCH 28
 #define SIGIO 29
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGPOLL SIGIO
-
 #define SIGPWR 30
 #define SIGSYS 31
 #define SIGUNUSED 31
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGRTMIN 32
 #define SIGRTMAX _NSIG
-
 #define SIGSWI 32
-
 #define SA_NOCLDSTOP 0x00000001
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SA_NOCLDWAIT 0x00000002
 #define SA_SIGINFO 0x00000004
 #define SA_THIRTYTWO 0x02000000
 #define SA_RESTORER 0x04000000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SA_ONSTACK 0x08000000
 #define SA_RESTART 0x10000000
 #define SA_NODEFER 0x40000000
 #define SA_RESETHAND 0x80000000
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SA_NOMASK SA_NODEFER
 #define SA_ONESHOT SA_RESETHAND
-
 #define SS_ONSTACK 1
 #define SS_DISABLE 2
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MINSIGSTKSZ 2048
 #define SIGSTKSZ 8192
-
 #include <asm-generic/signal.h>
-
 struct sigaction {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  union {
  __sighandler_t _sa_handler;
  void (*_sa_sigaction)(int, struct siginfo *, void *);
  } _u;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  sigset_t sa_mask;
  unsigned long sa_flags;
  void (*sa_restorer)(void);
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define sa_handler _u._sa_handler
 #define sa_sigaction _u._sa_sigaction
-
 typedef struct sigaltstack {
  void __user *ss_sp;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int ss_flags;
  size_t ss_size;
 } stack_t;
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */