diff --git a/libc/kernel/common/linux/ipv6.h b/libc/kernel/common/linux/ipv6.h
index f4ee9a1..80d8c80 100644
--- a/libc/kernel/common/linux/ipv6.h
+++ b/libc/kernel/common/linux/ipv6.h
@@ -7,127 +7,138 @@
  ***   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 _IPV6_H
 #define _IPV6_H
-
 #include <linux/types.h>
 #include <linux/in6.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/byteorder.h>
-
 #define IPV6_MIN_MTU 1280
-
 struct in6_pktinfo {
  struct in6_addr ipi6_addr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int ipi6_ifindex;
 };
-
 struct ip6_mtuinfo {
  struct sockaddr_in6 ip6m_addr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 ip6m_mtu;
 };
-
 struct in6_ifreq {
  struct in6_addr ifr6_addr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 ifr6_prefixlen;
  int ifr6_ifindex;
 };
-
 #define IPV6_SRCRT_STRICT 0x01  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPV6_SRCRT_TYPE_0 0  
 #define IPV6_SRCRT_TYPE_2 2  
-
 struct ipv6_rt_hdr {
  __u8 nexthdr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 hdrlen;
  __u8 type;
  __u8 segments_left;
-
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct ipv6_opt_hdr {
  __u8 nexthdr;
  __u8 hdrlen;
-
 } __attribute__((packed));
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ipv6_destopt_hdr ipv6_opt_hdr
 #define ipv6_hopopt_hdr ipv6_opt_hdr
-
 struct rt0_hdr {
  struct ipv6_rt_hdr rt_hdr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 reserved;
  struct in6_addr addr[0];
-
 #define rt0_type rt_hdr.type
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct rt2_hdr {
  struct ipv6_rt_hdr rt_hdr;
  __u32 reserved;
  struct in6_addr addr;
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define rt2_type rt_hdr.type
 };
-
 struct ipv6_destopt_hao {
  __u8 type;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 length;
  struct in6_addr addr;
 } __attribute__((packed));
-
 struct ipv6hdr {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifdef __LITTLE_ENDIAN_BITFIELD
  __u8 priority:4,
  version:4;
 #elif defined(__BIG_ENDIAN_BITFIELD)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 version:4,
  priority:4;
 #else
 #error "Please fix <asm/byteorder.h>"
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
  __u8 flow_lbl[3];
-
  __be16 payload_len;
  __u8 nexthdr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 hop_limit;
-
  struct in6_addr saddr;
  struct in6_addr daddr;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
  DEVCONF_FORWARDING = 0,
  DEVCONF_HOPLIMIT,
  DEVCONF_MTU6,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_ACCEPT_RA,
  DEVCONF_ACCEPT_REDIRECTS,
  DEVCONF_AUTOCONF,
  DEVCONF_DAD_TRANSMITS,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_RTR_SOLICITS,
  DEVCONF_RTR_SOLICIT_INTERVAL,
  DEVCONF_RTR_SOLICIT_DELAY,
  DEVCONF_USE_TEMPADDR,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_TEMP_VALID_LFT,
  DEVCONF_TEMP_PREFERED_LFT,
  DEVCONF_REGEN_MAX_RETRY,
  DEVCONF_MAX_DESYNC_FACTOR,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_MAX_ADDRESSES,
  DEVCONF_FORCE_MLD_VERSION,
  DEVCONF_ACCEPT_RA_DEFRTR,
  DEVCONF_ACCEPT_RA_PINFO,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_ACCEPT_RA_RTR_PREF,
  DEVCONF_RTR_PROBE_INTERVAL,
  DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
  DEVCONF_PROXY_NDP,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_OPTIMISTIC_DAD,
  DEVCONF_ACCEPT_SOURCE_ROUTE,
  DEVCONF_MC_FORWARDING,
  DEVCONF_DISABLE_IPV6,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  DEVCONF_ACCEPT_DAD,
  DEVCONF_FORCE_TLLAO,
  DEVCONF_MAX
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif