diff --git a/libc/kernel/common/linux/ppdev.h b/libc/kernel/common/linux/ppdev.h
index c43f8b9..2fa785c 100644
--- a/libc/kernel/common/linux/ppdev.h
+++ b/libc/kernel/common/linux/ppdev.h
@@ -7,65 +7,58 @@
  ***   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!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #define PP_IOCTL 'p'
-
 #define PPSETMODE _IOW(PP_IOCTL, 0x80, int)
-
 #define PPRSTATUS _IOR(PP_IOCTL, 0x81, unsigned char)
 #define PPWSTATUS OBSOLETE__IOW(PP_IOCTL, 0x82, unsigned char)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPRCONTROL _IOR(PP_IOCTL, 0x83, unsigned char)
 #define PPWCONTROL _IOW(PP_IOCTL, 0x84, unsigned char)
-
 struct ppdev_frob_struct {
  unsigned char mask;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned char val;
 };
 #define PPFCONTROL _IOW(PP_IOCTL, 0x8e, struct ppdev_frob_struct)
-
 #define PPRDATA _IOR(PP_IOCTL, 0x85, unsigned char)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPWDATA _IOW(PP_IOCTL, 0x86, unsigned char)
-
 #define PPRECONTROL OBSOLETE__IOR(PP_IOCTL, 0x87, unsigned char)
 #define PPWECONTROL OBSOLETE__IOW(PP_IOCTL, 0x88, unsigned char)
-
 #define PPRFIFO OBSOLETE__IOR(PP_IOCTL, 0x89, unsigned char)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPWFIFO OBSOLETE__IOW(PP_IOCTL, 0x8a, unsigned char)
-
 #define PPCLAIM _IO(PP_IOCTL, 0x8b)
-
 #define PPRELEASE _IO(PP_IOCTL, 0x8c)
-
 #define PPYIELD _IO(PP_IOCTL, 0x8d)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPEXCL _IO(PP_IOCTL, 0x8f)
-
 #define PPDATADIR _IOW(PP_IOCTL, 0x90, int)
-
 #define PPNEGOT _IOW(PP_IOCTL, 0x91, int)
-
 #define PPWCTLONIRQ _IOW(PP_IOCTL, 0x92, unsigned char)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPCLRIRQ _IOR(PP_IOCTL, 0x93, int)
-
 #define PPSETPHASE _IOW(PP_IOCTL, 0x94, int)
-
 #define PPGETTIME _IOR(PP_IOCTL, 0x95, struct timeval)
 #define PPSETTIME _IOW(PP_IOCTL, 0x96, struct timeval)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPGETMODES _IOR(PP_IOCTL, 0x97, unsigned int)
-
 #define PPGETMODE _IOR(PP_IOCTL, 0x98, int)
 #define PPGETPHASE _IOR(PP_IOCTL, 0x99, int)
-
 #define PPGETFLAGS _IOR(PP_IOCTL, 0x9a, int)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PPSETFLAGS _IOW(PP_IOCTL, 0x9b, int)
-
 #define PP_FASTWRITE (1<<2)
 #define PP_FASTREAD (1<<3)
 #define PP_W91284PIC (1<<4)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PP_FLAGMASK (PP_FASTWRITE | PP_FASTREAD | PP_W91284PIC)
-