diff --git a/libc/kernel/common/linux/prctl.h b/libc/kernel/common/linux/prctl.h
index a7631a2..8906639 100644
--- a/libc/kernel/common/linux/prctl.h
+++ b/libc/kernel/common/linux/prctl.h
@@ -7,55 +7,62 @@
  ***   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_PRCTL_H
 #define _LINUX_PRCTL_H
-
 #define PR_SET_PDEATHSIG 1  
 #define PR_GET_PDEATHSIG 2  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_GET_DUMPABLE 3
 #define PR_SET_DUMPABLE 4
-
 #define PR_GET_UNALIGN 5
 #define PR_SET_UNALIGN 6
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_UNALIGN_NOPRINT 1  
 #define PR_UNALIGN_SIGBUS 2  
-
 #define PR_GET_KEEPCAPS 7
 #define PR_SET_KEEPCAPS 8
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_GET_FPEMU 9
 #define PR_SET_FPEMU 10
 #define PR_FPEMU_NOPRINT 1  
 #define PR_FPEMU_SIGFPE 2  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_GET_FPEXC 11
 #define PR_SET_FPEXC 12
 #define PR_FP_EXC_SW_ENABLE 0x80  
 #define PR_FP_EXC_DIV 0x010000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_FP_EXC_OVF 0x020000  
 #define PR_FP_EXC_UND 0x040000  
 #define PR_FP_EXC_RES 0x080000  
 #define PR_FP_EXC_INV 0x100000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_FP_EXC_DISABLED 0  
 #define PR_FP_EXC_NONRECOV 1  
 #define PR_FP_EXC_ASYNC 2  
 #define PR_FP_EXC_PRECISE 3  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_GET_TIMING 13
 #define PR_SET_TIMING 14
 #define PR_TIMING_STATISTICAL 0  
 #define PR_TIMING_TIMESTAMP 1  
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_SET_NAME 15  
 #define PR_GET_NAME 16  
-
 #define PR_GET_ENDIAN 19
 #define PR_SET_ENDIAN 20
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_ENDIAN_BIG 0
 #define PR_ENDIAN_LITTLE 1  
 #define PR_ENDIAN_PPC_LITTLE 2  
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */