diff --git a/libc/kernel/common/linux/udp.h b/libc/kernel/common/linux/udp.h
index e4bf864..53a78c4 100644
--- a/libc/kernel/common/linux/udp.h
+++ b/libc/kernel/common/linux/udp.h
@@ -7,24 +7,29 @@
  ***   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_UDP_H
 #define _LINUX_UDP_H
-
 #include <linux/types.h>
-
 struct udphdr {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u16 source;
  __u16 dest;
  __u16 len;
  __u16 check;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-
 #define UDP_CORK 1  
 #define UDP_ENCAP 100  
-
 #define UDP_ENCAP_ESPINUDP_NON_IKE 1  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define UDP_ENCAP_ESPINUDP 2  
-
 #endif