diff --git a/libc/kernel/common/linux/delay.h b/libc/kernel/common/linux/delay.h
index e032b6f..a6ba250 100644
--- a/libc/kernel/common/linux/delay.h
+++ b/libc/kernel/common/linux/delay.h
@@ -7,23 +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_DELAY_H
 #define _LINUX_DELAY_H
-
 #include <asm/delay.h>
-
 #ifndef MAX_UDELAY_MS
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define MAX_UDELAY_MS 5
 #endif
-
 #ifndef mdelay
 #define mdelay(n) (  (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) :   ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef ndelay
 #define ndelay(x) udelay(((x)+999)/1000)
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif