diff --git a/libc/kernel/common/linux/usb.h b/libc/kernel/common/linux/usb.h
index ceee194..2dfbee3 100644
--- a/libc/kernel/common/linux/usb.h
+++ b/libc/kernel/common/linux/usb.h
@@ -7,15 +7,20 @@
  ***   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_USB_H
 #define __LINUX_USB_H
-
 #include <linux/mod_devicetable.h>
 #include <linux/usb_ch9.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define USB_MAJOR 180
 #define USB_DEVICE_MAJOR 189
-
 #endif