diff --git a/libc/kernel/common/linux/sem.h b/libc/kernel/common/linux/sem.h
index dfa531b..5c15194 100644
--- a/libc/kernel/common/linux/sem.h
+++ b/libc/kernel/common/linux/sem.h
@@ -7,76 +7,85 @@
  ***   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_SEM_H
 #define _LINUX_SEM_H
-
 #include <linux/ipc.h>
-
 #define SEM_UNDO 0x1000  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define GETPID 11  
 #define GETVAL 12  
 #define GETALL 13  
 #define GETNCNT 14  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define GETZCNT 15  
 #define SETVAL 16  
 #define SETALL 17  
-
 #define SEM_STAT 18
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SEM_INFO 19
-
 struct semid_ds {
  struct ipc_perm sem_perm;
  __kernel_time_t sem_otime;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __kernel_time_t sem_ctime;
  struct sem *sem_base;
  struct sem_queue *sem_pending;
  struct sem_queue **sem_pending_last;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct sem_undo *undo;
  unsigned short sem_nsems;
 };
-
 #include <asm/sembuf.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct sembuf {
  unsigned short sem_num;
  short sem_op;
  short sem_flg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 union semun {
  int val;
  struct semid_ds __user *buf;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned short __user *array;
  struct seminfo __user *__buf;
  void __user *__pad;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct seminfo {
  int semmap;
  int semmni;
  int semmns;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int semmnu;
  int semmsl;
  int semopm;
  int semume;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int semusz;
  int semvmx;
  int semaem;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SEMMNI 128  
 #define SEMMSL 250  
 #define SEMMNS (SEMMNI*SEMMSL)  
 #define SEMOPM 32  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SEMVMX 32767  
 #define SEMAEM SEMVMX  
-
 #define SEMUME SEMOPM  
 #define SEMMNU SEMMNS  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SEMMAP SEMMNS  
 #define SEMUSZ 20  
-
 #endif