diff --git a/libc/kernel/arch-x86/asm/required-features.h b/libc/kernel/arch-x86/asm/required-features.h
index a96517a..df9d33c 100644
--- a/libc/kernel/arch-x86/asm/required-features.h
+++ b/libc/kernel/arch-x86/asm/required-features.h
@@ -7,38 +7,42 @@
  ***   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_REQUIRED_FEATURES_H
 #define _ASM_REQUIRED_FEATURES_H 1
-
 #define NEED_FPU (1<<(X86_FEATURE_FPU & 31))
-
 #define NEED_PAE 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NEED_CX8 0
-
 #define NEED_CMOV 0
-
 #define NEED_3DNOW 0
-
 #define NEED_PSE 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NEED_MSR 0
 #define NEED_PGE 0
 #define NEED_FXSR 0
 #define NEED_XMM 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define NEED_XMM2 0
 #define NEED_LM 0
-
 #define REQUIRED_MASK0 (NEED_FPU|NEED_PSE|NEED_MSR|NEED_PAE|  NEED_CX8|NEED_PGE|NEED_FXSR|NEED_CMOV|  NEED_XMM|NEED_XMM2)
 #define SSE_MASK (NEED_XMM|NEED_XMM2)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define REQUIRED_MASK1 (NEED_LM|NEED_3DNOW)
-
 #define REQUIRED_MASK2 0
 #define REQUIRED_MASK3 0
 #define REQUIRED_MASK4 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define REQUIRED_MASK5 0
 #define REQUIRED_MASK6 0
 #define REQUIRED_MASK7 0
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */