diff --git a/libc/kernel/common/linux/threads.h b/libc/kernel/common/linux/threads.h
index 5d85878..118bbe7 100644
--- a/libc/kernel/common/linux/threads.h
+++ b/libc/kernel/common/linux/threads.h
@@ -7,17 +7,20 @@
  ***   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_THREADS_H
 #define _LINUX_THREADS_H
-
 #define NR_CPUS 1
-
 #define MIN_THREADS_LEFT_FOR_ROOT 4
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
-
 #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 :   (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
-
 #endif