diff --git a/libc/kernel/common/linux/icmp.h b/libc/kernel/common/linux/icmp.h
index c5b58bb..3a2580e 100644
--- a/libc/kernel/common/linux/icmp.h
+++ b/libc/kernel/common/linux/icmp.h
@@ -7,75 +7,88 @@
  ***   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_ICMP_H
 #define _LINUX_ICMP_H
-
 #include <linux/types.h>
-
 #define ICMP_ECHOREPLY 0  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_DEST_UNREACH 3  
 #define ICMP_SOURCE_QUENCH 4  
 #define ICMP_REDIRECT 5  
 #define ICMP_ECHO 8  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_TIME_EXCEEDED 11  
 #define ICMP_PARAMETERPROB 12  
 #define ICMP_TIMESTAMP 13  
 #define ICMP_TIMESTAMPREPLY 14  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_INFO_REQUEST 15  
 #define ICMP_INFO_REPLY 16  
 #define ICMP_ADDRESS 17  
 #define ICMP_ADDRESSREPLY 18  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NR_ICMP_TYPES 18
-
 #define ICMP_NET_UNREACH 0  
 #define ICMP_HOST_UNREACH 1  
 #define ICMP_PROT_UNREACH 2  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_PORT_UNREACH 3  
 #define ICMP_FRAG_NEEDED 4  
 #define ICMP_SR_FAILED 5  
 #define ICMP_NET_UNKNOWN 6
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_HOST_UNKNOWN 7
 #define ICMP_HOST_ISOLATED 8
 #define ICMP_NET_ANO 9
 #define ICMP_HOST_ANO 10
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_NET_UNR_TOS 11
 #define ICMP_HOST_UNR_TOS 12
 #define ICMP_PKT_FILTERED 13  
 #define ICMP_PREC_VIOLATION 14  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_PREC_CUTOFF 15  
 #define NR_ICMP_UNREACH 15  
-
 #define ICMP_REDIR_NET 0  
 #define ICMP_REDIR_HOST 1  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_REDIR_NETTOS 2  
 #define ICMP_REDIR_HOSTTOS 3  
-
 #define ICMP_EXC_TTL 0  
 #define ICMP_EXC_FRAGTIME 1  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct icmphdr {
  __u8 type;
  __u8 code;
  __u16 checksum;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  union {
  struct {
  __u16 id;
  __u16 sequence;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  } echo;
  __u32 gateway;
  struct {
  __u16 __unused_field;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 mtu;
  } frag;
  } un;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ICMP_FILTER 1
-
 struct icmp_filter {
  __u32 data;
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif