diff --git a/libc/kernel/common/linux/l3g4200d.h b/libc/kernel/common/linux/l3g4200d.h
index 0a0f8cd..210f50b 100644
--- a/libc/kernel/common/linux/l3g4200d.h
+++ b/libc/kernel/common/linux/l3g4200d.h
@@ -7,21 +7,24 @@
  ***   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 __L3G4200D_H__
 #define __L3G4200D_H__
-
 #include <linux/ioctl.h>  
-
 #define L3G4200D_NAME "l3g4200d"
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define L3G4200D_IOCTL_BASE 77
-
 #define L3G4200D_IOCTL_SET_DELAY _IOW(L3G4200D_IOCTL_BASE, 0, int)
 #define L3G4200D_IOCTL_GET_DELAY _IOR(L3G4200D_IOCTL_BASE, 1, int)
 #define L3G4200D_IOCTL_SET_ENABLE _IOW(L3G4200D_IOCTL_BASE, 2, int)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define L3G4200D_IOCTL_GET_ENABLE _IOR(L3G4200D_IOCTL_BASE, 3, int)
-
 #endif
-