diff --git a/libc/kernel/common/linux/nfs2.h b/libc/kernel/common/linux/nfs2.h
index 1bb5df2..0f6fcf8 100644
--- a/libc/kernel/common/linux/nfs2.h
+++ b/libc/kernel/common/linux/nfs2.h
@@ -7,69 +7,84 @@
  ***   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_NFS2_H
 #define _LINUX_NFS2_H
-
 #define NFS2_PORT 2049
 #define NFS2_MAXDATA 8192
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS2_MAXPATHLEN 1024
 #define NFS2_MAXNAMLEN 255
 #define NFS2_MAXGROUPS 16
 #define NFS2_FHSIZE 32
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS2_COOKIESIZE 4
 #define NFS2_FIFO_DEV (-1)
 #define NFS2MODE_FMT 0170000
 #define NFS2MODE_DIR 0040000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS2MODE_CHR 0020000
 #define NFS2MODE_BLK 0060000
 #define NFS2MODE_REG 0100000
 #define NFS2MODE_LNK 0120000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS2MODE_SOCK 0140000
 #define NFS2MODE_FIFO 0010000
-
 enum nfs2_ftype {
  NF2NON = 0,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  NF2REG = 1,
  NF2DIR = 2,
  NF2BLK = 3,
  NF2CHR = 4,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  NF2LNK = 5,
  NF2SOCK = 6,
  NF2BAD = 7,
  NF2FIFO = 8
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct nfs2_fh {
  char data[NFS2_FHSIZE];
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS2_VERSION 2
 #define NFSPROC_NULL 0
 #define NFSPROC_GETATTR 1
 #define NFSPROC_SETATTR 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFSPROC_ROOT 3
 #define NFSPROC_LOOKUP 4
 #define NFSPROC_READLINK 5
 #define NFSPROC_READ 6
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFSPROC_WRITECACHE 7
 #define NFSPROC_WRITE 8
 #define NFSPROC_CREATE 9
 #define NFSPROC_REMOVE 10
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFSPROC_RENAME 11
 #define NFSPROC_LINK 12
 #define NFSPROC_SYMLINK 13
 #define NFSPROC_MKDIR 14
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFSPROC_RMDIR 15
 #define NFSPROC_READDIR 16
 #define NFSPROC_STATFS 17
-
 #define NFS_MNT_PROGRAM 100005
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS_MNT_VERSION 1
 #define MNTPROC_NULL 0
 #define MNTPROC_MNT 1
 #define MNTPROC_UMNT 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MNTPROC_UMNTALL 4
-
 #endif