diff --git a/libc/kernel/common/linux/loop.h b/libc/kernel/common/linux/loop.h
index 9cdfd38..94baeb2 100644
--- a/libc/kernel/common/linux/loop.h
+++ b/libc/kernel/common/linux/loop.h
@@ -7,71 +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_LOOP_H
 #define _LINUX_LOOP_H
-
 #define LO_NAME_SIZE 64
 #define LO_KEY_SIZE 32
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
  LO_FLAGS_READ_ONLY = 1,
  LO_FLAGS_USE_AOPS = 2,
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/posix_types.h>  
 #include <asm/types.h>  
-
 struct loop_info {
  int lo_number;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __kernel_old_dev_t lo_device;
  unsigned long lo_inode;
  __kernel_old_dev_t lo_rdevice;
  int lo_offset;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int lo_encrypt_type;
  int lo_encrypt_key_size;
  int lo_flags;
  char lo_name[LO_NAME_SIZE];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned char lo_encrypt_key[LO_KEY_SIZE];
  unsigned long lo_init[2];
  char reserved[4];
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct loop_info64 {
  __u64 lo_device;
  __u64 lo_inode;
  __u64 lo_rdevice;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u64 lo_offset;
  __u64 lo_sizelimit;
  __u32 lo_number;
  __u32 lo_encrypt_type;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 lo_encrypt_key_size;
  __u32 lo_flags;
  __u8 lo_file_name[LO_NAME_SIZE];
  __u8 lo_crypt_name[LO_NAME_SIZE];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 lo_encrypt_key[LO_KEY_SIZE];
  __u64 lo_init[2];
 };
-
 #define LO_CRYPT_NONE 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LO_CRYPT_XOR 1
 #define LO_CRYPT_DES 2
 #define LO_CRYPT_FISH2 3  
 #define LO_CRYPT_BLOW 4
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LO_CRYPT_CAST128 5
 #define LO_CRYPT_IDEA 6
 #define LO_CRYPT_DUMMY 9
 #define LO_CRYPT_SKIPJACK 10
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LO_CRYPT_CRYPTOAPI 18
 #define MAX_LO_CRYPT 20
-
 #define LOOP_SET_FD 0x4C00
 #define LOOP_CLR_FD 0x4C01
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LOOP_SET_STATUS 0x4C02
 #define LOOP_GET_STATUS 0x4C03
 #define LOOP_SET_STATUS64 0x4C04
 #define LOOP_GET_STATUS64 0x4C05
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define LOOP_CHANGE_FD 0x4C06
-
 #endif