diff --git a/libc/kernel/common/linux/sched.h b/libc/kernel/common/linux/sched.h
index 6b781eb..c06b8ec 100644
--- a/libc/kernel/common/linux/sched.h
+++ b/libc/kernel/common/linux/sched.h
@@ -7,35 +7,44 @@
  ***   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_SCHED_H
 #define _LINUX_SCHED_H
-
 #include <linux/auxvec.h>  
-
 #define CSIGNAL 0x000000ff  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CLONE_VM 0x00000100  
 #define CLONE_FS 0x00000200  
 #define CLONE_FILES 0x00000400  
 #define CLONE_SIGHAND 0x00000800  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CLONE_PTRACE 0x00002000  
 #define CLONE_VFORK 0x00004000  
 #define CLONE_PARENT 0x00008000  
 #define CLONE_THREAD 0x00010000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CLONE_NEWNS 0x00020000  
 #define CLONE_SYSVSEM 0x00040000  
 #define CLONE_SETTLS 0x00080000  
 #define CLONE_PARENT_SETTID 0x00100000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CLONE_CHILD_CLEARTID 0x00200000  
 #define CLONE_DETACHED 0x00400000  
 #define CLONE_UNTRACED 0x00800000  
 #define CLONE_CHILD_SETTID 0x01000000  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define CLONE_STOPPED 0x02000000  
-
 #define SCHED_NORMAL 0
 #define SCHED_FIFO 1
 #define SCHED_RR 2
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SCHED_BATCH 3
-
 #endif