diff --git a/libc/kernel/common/asm-generic/errno-base.h b/libc/kernel/common/asm-generic/errno-base.h
index 2fb4a33..82c5a0e 100644
--- a/libc/kernel/common/asm-generic/errno-base.h
+++ b/libc/kernel/common/asm-generic/errno-base.h
@@ -7,44 +7,58 @@
  ***   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_ERRNO_BASE_H
 #define _ASM_GENERIC_ERRNO_BASE_H
-
 #define EPERM 1  
 #define ENOENT 2  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ESRCH 3  
 #define EINTR 4  
 #define EIO 5  
 #define ENXIO 6  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define E2BIG 7  
 #define ENOEXEC 8  
 #define EBADF 9  
 #define ECHILD 10  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define EAGAIN 11  
 #define ENOMEM 12  
 #define EACCES 13  
 #define EFAULT 14  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ENOTBLK 15  
 #define EBUSY 16  
 #define EEXIST 17  
 #define EXDEV 18  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ENODEV 19  
 #define ENOTDIR 20  
 #define EISDIR 21  
 #define EINVAL 22  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ENFILE 23  
 #define EMFILE 24  
 #define ENOTTY 25  
 #define ETXTBSY 26  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define EFBIG 27  
 #define ENOSPC 28  
 #define ESPIPE 29  
 #define EROFS 30  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define EMLINK 31  
 #define EPIPE 32  
 #define EDOM 33  
 #define ERANGE 34  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif