diff --git a/libc/kernel/common/asm-generic/poll.h b/libc/kernel/common/asm-generic/poll.h
index b8cd3da..f7b911d 100644
--- a/libc/kernel/common/asm-generic/poll.h
+++ b/libc/kernel/common/asm-generic/poll.h
@@ -7,40 +7,50 @@
  ***   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_POLL_H
 #define __ASM_GENERIC_POLL_H
-
 #define POLLIN 0x0001
 #define POLLPRI 0x0002
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define POLLOUT 0x0004
 #define POLLERR 0x0008
 #define POLLHUP 0x0010
 #define POLLNVAL 0x0020
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define POLLRDNORM 0x0040
 #define POLLRDBAND 0x0080
 #ifndef POLLWRNORM
 #define POLLWRNORM 0x0100
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef POLLWRBAND
 #define POLLWRBAND 0x0200
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef POLLMSG
 #define POLLMSG 0x0400
 #endif
 #ifndef POLLREMOVE
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define POLLREMOVE 0x1000
 #endif
 #ifndef POLLRDHUP
 #define POLLRDHUP 0x2000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 struct pollfd {
  int fd;
  short events;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  short revents;
 };
-
 #endif