diff --git a/libc/kernel/common/linux/ipsec.h b/libc/kernel/common/linux/ipsec.h
index 56acafa..e9758eb 100644
--- a/libc/kernel/common/linux/ipsec.h
+++ b/libc/kernel/common/linux/ipsec.h
@@ -7,50 +7,57 @@
  ***   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_IPSEC_H
 #define _LINUX_IPSEC_H
-
 #include <linux/pfkeyv2.h>
-
 #define IPSEC_PORT_ANY 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define IPSEC_ULPROTO_ANY 255
 #define IPSEC_PROTO_ANY 255
-
 enum {
  IPSEC_MODE_ANY = 0,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  IPSEC_MODE_TRANSPORT = 1,
  IPSEC_MODE_TUNNEL = 2,
  IPSEC_MODE_BEET = 3
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
  IPSEC_DIR_ANY = 0,
  IPSEC_DIR_INBOUND = 1,
  IPSEC_DIR_OUTBOUND = 2,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  IPSEC_DIR_FWD = 3,
  IPSEC_DIR_MAX = 4,
  IPSEC_DIR_INVALID = 5
 };
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
  IPSEC_POLICY_DISCARD = 0,
  IPSEC_POLICY_NONE = 1,
  IPSEC_POLICY_IPSEC = 2,
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  IPSEC_POLICY_ENTRUST = 3,
  IPSEC_POLICY_BYPASS = 4
 };
-
 enum {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  IPSEC_LEVEL_DEFAULT = 0,
  IPSEC_LEVEL_USE = 1,
  IPSEC_LEVEL_REQUIRE = 2,
  IPSEC_LEVEL_UNIQUE = 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 #define IPSEC_MANUAL_REQID_MAX 0x3fff
-
 #define IPSEC_REPLAYWSIZE 32
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */