diff --git a/libc/kernel/common/linux/atmioc.h b/libc/kernel/common/linux/atmioc.h
index d004339..cad0b8a 100644
--- a/libc/kernel/common/linux/atmioc.h
+++ b/libc/kernel/common/linux/atmioc.h
@@ -7,34 +7,43 @@
  ***   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_ATMIOC_H
 #define _LINUX_ATMIOC_H
-
 #include <asm/ioctl.h>
-
 #define ATMIOC_PHYCOM 0x00  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ATMIOC_PHYCOM_END 0x0f
 #define ATMIOC_PHYTYP 0x10  
 #define ATMIOC_PHYTYP_END 0x2f
 #define ATMIOC_PHYPRV 0x30  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ATMIOC_PHYPRV_END 0x4f
 #define ATMIOC_SARCOM 0x50  
 #define ATMIOC_SARCOM_END 0x50
 #define ATMIOC_SARPRV 0x60  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ATMIOC_SARPRV_END 0x7f
 #define ATMIOC_ITF 0x80  
 #define ATMIOC_ITF_END 0x8f
 #define ATMIOC_BACKEND 0x90  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ATMIOC_BACKEND_END 0xaf
-
 #define ATMIOC_AREQUIPA 0xc0  
 #define ATMIOC_LANE 0xd0  
 #define ATMIOC_MPOA 0xd8  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ATMIOC_CLIP 0xe0  
 #define ATMIOC_CLIP_END 0xef
 #define ATMIOC_SPECIAL 0xf0  
 #define ATMIOC_SPECIAL_END 0xff
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif