diff --git a/libc/kernel/common/linux/nfsacl.h b/libc/kernel/common/linux/nfsacl.h
index 7dd95ab..675471a 100644
--- a/libc/kernel/common/linux/nfsacl.h
+++ b/libc/kernel/common/linux/nfsacl.h
@@ -7,26 +7,30 @@
  ***   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_NFSACL_H
 #define __LINUX_NFSACL_H
-
 #define NFS_ACL_PROGRAM 100227
-
 #define ACLPROC2_GETACL 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ACLPROC2_SETACL 2
 #define ACLPROC2_GETATTR 3
 #define ACLPROC2_ACCESS 4
-
 #define ACLPROC3_GETACL 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ACLPROC3_SETACL 2
-
 #define NFS_ACL 0x0001
 #define NFS_ACLCNT 0x0002
 #define NFS_DFACL 0x0004
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NFS_DFACLCNT 0x0008
-
 #define NFS_ACL_DEFAULT 0x1000
-
 #endif