diff --git a/libc/kernel/arch-arm/asm/domain.h b/libc/kernel/arch-arm/asm/domain.h
index 973109e..84adccb 100644
--- a/libc/kernel/arch-arm/asm/domain.h
+++ b/libc/kernel/arch-arm/asm/domain.h
@@ -7,26 +7,30 @@
  ***   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_PROC_DOMAIN_H
 #define __ASM_PROC_DOMAIN_H
-
 #define DOMAIN_KERNEL 0
 #define DOMAIN_TABLE 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DOMAIN_USER 1
 #define DOMAIN_IO 2
-
 #define DOMAIN_NOACCESS 0
 #define DOMAIN_CLIENT 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define DOMAIN_MANAGER 3
-
 #define domain_val(dom,type) ((type) << (2*(dom)))
-
 #ifndef __ASSEMBLY__
-
 #define set_domain(x) do { } while (0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define modify_domain(dom,type) do { } while (0)
-
 #endif
 #endif