diff --git a/libc/kernel/common/linux/ip.h b/libc/kernel/common/linux/ip.h
index 040789d..14c3464 100644
--- a/libc/kernel/common/linux/ip.h
+++ b/libc/kernel/common/linux/ip.h
@@ -7,112 +7,127 @@
  ***   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_IP_H
 #define _LINUX_IP_H
 #include <linux/types.h>
 #include <asm/byteorder.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPTOS_TOS_MASK 0x1E
 #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
 #define IPTOS_LOWDELAY 0x10
 #define IPTOS_THROUGHPUT 0x08
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPTOS_RELIABILITY 0x04
 #define IPTOS_MINCOST 0x02
-
 #define IPTOS_PREC_MASK 0xE0
 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPTOS_PREC_NETCONTROL 0xe0
 #define IPTOS_PREC_INTERNETCONTROL 0xc0
 #define IPTOS_PREC_CRITIC_ECP 0xa0
 #define IPTOS_PREC_FLASHOVERRIDE 0x80
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPTOS_PREC_FLASH 0x60
 #define IPTOS_PREC_IMMEDIATE 0x40
 #define IPTOS_PREC_PRIORITY 0x20
 #define IPTOS_PREC_ROUTINE 0x00
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_COPY 0x80
 #define IPOPT_CLASS_MASK 0x60
 #define IPOPT_NUMBER_MASK 0x1f
-
 #define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
 #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
-
 #define IPOPT_CONTROL 0x00
 #define IPOPT_RESERVED1 0x20
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_MEASUREMENT 0x40
 #define IPOPT_RESERVED2 0x60
-
 #define IPOPT_END (0 |IPOPT_CONTROL)
 #define IPOPT_NOOP (1 |IPOPT_CONTROL)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
 #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
 #define IPOPT_RR (7 |IPOPT_CONTROL)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
 #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
-
 #define IPVERSION 4
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MAXTTL 255
 #define IPDEFTTL 64
-
 #define IPOPT_OPTVAL 0
 #define IPOPT_OLEN 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_OFFSET 2
 #define IPOPT_MINOFF 4
 #define MAX_IPOPTLEN 40
 #define IPOPT_NOP IPOPT_NOOP
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_EOL IPOPT_END
 #define IPOPT_TS IPOPT_TIMESTAMP
-
 #define IPOPT_TS_TSONLY 0  
 #define IPOPT_TS_TSANDADDR 1  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPOPT_TS_PRESPEC 3  
-
 struct iphdr {
 #ifdef __LITTLE_ENDIAN_BITFIELD
  __u8 ihl:4,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  version:4;
 #elif defined (__BIG_ENDIAN_BITFIELD)
  __u8 version:4,
  ihl:4;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 #error "Please fix <asm/byteorder.h>"
 #endif
  __u8 tos;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __be16 tot_len;
  __be16 id;
  __be16 frag_off;
  __u8 ttl;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 protocol;
  __u16 check;
  __be32 saddr;
  __be32 daddr;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct ip_auth_hdr {
  __u8 nexthdr;
  __u8 hdrlen;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 reserved;
  __u32 spi;
  __u32 seq_no;
  __u8 auth_data[0];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 struct ip_esp_hdr {
  __u32 spi;
  __u32 seq_no;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 enc_data[0];
 };
-
 struct ip_comp_hdr {
  __u8 nexthdr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 flags;
  __u16 cpi;
 };
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */