diff --git a/libc/kernel/common/linux/ublock.h b/libc/kernel/common/linux/ublock.h
index aa19a81..59a9aab 100644
--- a/libc/kernel/common/linux/ublock.h
+++ b/libc/kernel/common/linux/ublock.h
@@ -7,75 +7,80 @@
  ***   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 __UBLOCK_H_
 #define __UBLOCK_H_
-
 #include <linux/types.h>
-
 #define UBLOCK_VERSION 0
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
  UBLOCK_INIT_IN = 0,
  UBLOCK_INIT_OUT = 1,
  UBLOCK_READY_IN = 2,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  UBLOCK_READY_OUT = 3,
  UBLOCK_READ_IN = 4,
  UBLOCK_READ_OUT = 5,
  UBLOCK_WRITE_IN = 6,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  UBLOCK_WRITE_OUT = 7,
 };
-
 struct ublock_in_header {
  __u32 seq;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 opcode;
 };
-
 struct ublock_out_header {
  __u32 seq;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 opcode;
 };
-
 struct ublock_init_in {
  __u32 version;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 max_buf;
  __u32 index;
 };
-
 struct ublock_init_out {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 version;
  __u32 max_buf;
  __u64 size;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct ublock_ready_in {
  __u32 _unused;
 };
-
 struct ublock_ready_out {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 _unused;
 };
-
 struct ublock_read_in {
  __u64 offset;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u64 length;
 };
-
 struct ublock_read_out {
  __s32 status;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 data[];
 };
-
 struct ublock_write_in {
  __u64 offset;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u64 length;
  __u8 data[];
 };
-
 struct ublock_write_out {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __s32 status;
 };
-
 #endif
-