diff --git a/libc/kernel/arch-arm/asm/ioctls.h b/libc/kernel/arch-arm/asm/ioctls.h
index 9df82bc..64d81bf 100644
--- a/libc/kernel/arch-arm/asm/ioctls.h
+++ b/libc/kernel/arch-arm/asm/ioctls.h
@@ -7,82 +7,99 @@
  ***   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 __ASM_ARM_IOCTLS_H
 #define __ASM_ARM_IOCTLS_H
-
 #include <asm/ioctl.h>
-
 #define TCGETS 0x5401
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TCSETS 0x5402
 #define TCSETSW 0x5403
 #define TCSETSF 0x5404
 #define TCGETA 0x5405
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TCSETA 0x5406
 #define TCSETAW 0x5407
 #define TCSETAF 0x5408
 #define TCSBRK 0x5409
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TCXONC 0x540A
 #define TCFLSH 0x540B
 #define TIOCEXCL 0x540C
 #define TIOCNXCL 0x540D
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCSCTTY 0x540E
 #define TIOCGPGRP 0x540F
 #define TIOCSPGRP 0x5410
 #define TIOCOUTQ 0x5411
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCSTI 0x5412
 #define TIOCGWINSZ 0x5413
 #define TIOCSWINSZ 0x5414
 #define TIOCMGET 0x5415
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCMBIS 0x5416
 #define TIOCMBIC 0x5417
 #define TIOCMSET 0x5418
 #define TIOCGSOFTCAR 0x5419
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCSSOFTCAR 0x541A
 #define FIONREAD 0x541B
 #define TIOCINQ FIONREAD
 #define TIOCLINUX 0x541C
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCCONS 0x541D
 #define TIOCGSERIAL 0x541E
 #define TIOCSSERIAL 0x541F
 #define TIOCPKT 0x5420
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define FIONBIO 0x5421
 #define TIOCNOTTY 0x5422
 #define TIOCSETD 0x5423
 #define TIOCGETD 0x5424
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TCSBRKP 0x5425  
 #define TIOCSBRK 0x5427  
 #define TIOCCBRK 0x5428  
 #define TIOCGSID 0x5429  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCGPTN _IOR('T',0x30, unsigned int)  
 #define TIOCSPTLCK _IOW('T',0x31, int)  
-
 #define FIONCLEX 0x5450  
 #define FIOCLEX 0x5451
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define FIOASYNC 0x5452
 #define TIOCSERCONFIG 0x5453
 #define TIOCSERGWILD 0x5454
 #define TIOCSERSWILD 0x5455
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCGLCKTRMIOS 0x5456
 #define TIOCSLCKTRMIOS 0x5457
 #define TIOCSERGSTRUCT 0x5458  
 #define TIOCSERGETLSR 0x5459  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCSERGETMULTI 0x545A  
 #define TIOCSERSETMULTI 0x545B  
-
 #define TIOCMIWAIT 0x545C  
 #define TIOCGICOUNT 0x545D  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define FIOQSIZE 0x545E
-
 #define TIOCPKT_DATA 0
 #define TIOCPKT_FLUSHREAD 1
 #define TIOCPKT_FLUSHWRITE 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCPKT_STOP 4
 #define TIOCPKT_START 8
 #define TIOCPKT_NOSTOP 16
 #define TIOCPKT_DOSTOP 32
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define TIOCSER_TEMT 0x01  
-
 #endif