diff --git a/libc/kernel/common/linux/compiler.h b/libc/kernel/common/linux/compiler.h
index 4055e33..9e6dc4b 100644
--- a/libc/kernel/common/linux/compiler.h
+++ b/libc/kernel/common/linux/compiler.h
@@ -7,32 +7,39 @@
  ***   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_COMPILER_H
 #define __LINUX_COMPILER_H
-
 #ifndef __ASSEMBLY__
-
 #define __user
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __kernel
 #define __safe
 #define __force
 #define __nocast
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __iomem
 #define __chk_user_ptr(x) (void)0
 #define __chk_io_ptr(x) (void)0
 #define __builtin_warning(x, y...) (1)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __acquires(x)
 #define __releases(x)
 #define __acquire(x) (void)0
 #define __release(x) (void)0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __cond_lock(x) (x)
-
 #endif
-
 #ifndef __attribute_const__
 #define __attribute_const__  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #endif