diff --git a/libc/kernel/common/linux/completion.h b/libc/kernel/common/linux/completion.h
index ee18211..d67d10a 100644
--- a/libc/kernel/common/linux/completion.h
+++ b/libc/kernel/common/linux/completion.h
@@ -7,26 +7,28 @@
  ***   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_COMPLETION_H
 #define __LINUX_COMPLETION_H
-
 #include <linux/wait.h>
-
 struct completion {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned int done;
  wait_queue_head_t wait;
 };
-
 #define COMPLETION_INITIALIZER(work)   { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define COMPLETION_INITIALIZER_ONSTACK(work)   ({ init_completion(&work); work; })
-
 #define DECLARE_COMPLETION(work)   struct completion work = COMPLETION_INITIALIZER(work)
-
 #define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
-
 #define INIT_COMPLETION(x) ((x).done = 0)
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif