diff --git a/libc/kernel/common/linux/kmod.h b/libc/kernel/common/linux/kmod.h
index d24456d..a561261 100644
--- a/libc/kernel/common/linux/kmod.h
+++ b/libc/kernel/common/linux/kmod.h
@@ -7,17 +7,23 @@
  ***   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_KMOD_H__
 #define __LINUX_KMOD_H__
-
 #include <linux/stddef.h>
 #include <linux/errno.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <linux/compiler.h>
-
 #define KMOD_PATH_LEN 256
-
 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
-
+struct key;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif