diff --git a/libc/kernel/common/linux/cache.h b/libc/kernel/common/linux/cache.h
index d281855..dca5a3c 100644
--- a/libc/kernel/common/linux/cache.h
+++ b/libc/kernel/common/linux/cache.h
@@ -7,48 +7,52 @@
  ***   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_CACHE_H
 #define __LINUX_CACHE_H
-
 #include <linux/kernel.h>
 #include <asm/cache.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef L1_CACHE_ALIGN
 #define L1_CACHE_ALIGN(x) ALIGN(x, L1_CACHE_BYTES)
 #endif
-
 #ifndef SMP_CACHE_BYTES
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SMP_CACHE_BYTES L1_CACHE_BYTES
 #endif
-
 #ifndef __read_mostly
 #define __read_mostly
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef ____cacheline_aligned
 #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef ____cacheline_aligned_in_smp
 #define ____cacheline_aligned_in_smp
 #endif
-
 #ifndef __cacheline_aligned
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define __cacheline_aligned   __attribute__((__aligned__(SMP_CACHE_BYTES),   __section__(".data.cacheline_aligned")))
 #endif
-
 #ifndef __cacheline_aligned_in_smp
 #define __cacheline_aligned_in_smp
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-
 #ifndef INTERNODE_CACHE_SHIFT
 #define INTERNODE_CACHE_SHIFT L1_CACHE_SHIFT
 #endif
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef ____cacheline_internodealigned_in_smp
 #define ____cacheline_internodealigned_in_smp
 #endif
-
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */