diff --git a/libc/kernel/common/linux/ptrace.h b/libc/kernel/common/linux/ptrace.h
index 079c0c8..e61a0e5 100644
--- a/libc/kernel/common/linux/ptrace.h
+++ b/libc/kernel/common/linux/ptrace.h
@@ -7,49 +7,55 @@
  ***   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_PTRACE_H
 #define _LINUX_PTRACE_H
-
 #define PTRACE_TRACEME 0
 #define PTRACE_PEEKTEXT 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_PEEKDATA 2
 #define PTRACE_PEEKUSR 3
 #define PTRACE_POKETEXT 4
 #define PTRACE_POKEDATA 5
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_POKEUSR 6
 #define PTRACE_CONT 7
 #define PTRACE_KILL 8
 #define PTRACE_SINGLESTEP 9
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_ATTACH 0x10
 #define PTRACE_DETACH 0x11
-
 #define PTRACE_SYSCALL 24
-
 #define PTRACE_SETOPTIONS 0x4200
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_GETEVENTMSG 0x4201
 #define PTRACE_GETSIGINFO 0x4202
 #define PTRACE_SETSIGINFO 0x4203
-
 #define PTRACE_O_TRACESYSGOOD 0x00000001
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_O_TRACEFORK 0x00000002
 #define PTRACE_O_TRACEVFORK 0x00000004
 #define PTRACE_O_TRACECLONE 0x00000008
 #define PTRACE_O_TRACEEXEC 0x00000010
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_O_TRACEVFORKDONE 0x00000020
 #define PTRACE_O_TRACEEXIT 0x00000040
-
 #define PTRACE_O_MASK 0x0000007f
-
 #define PTRACE_EVENT_FORK 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_EVENT_VFORK 2
 #define PTRACE_EVENT_CLONE 3
 #define PTRACE_EVENT_EXEC 4
 #define PTRACE_EVENT_VFORK_DONE 5
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PTRACE_EVENT_EXIT 6
-
 #include <asm/ptrace.h>
-
 #endif