diff --git a/libc/kernel/common/linux/ashmem.h b/libc/kernel/common/linux/ashmem.h
index a57d1de..e402e4e 100644
--- a/libc/kernel/common/linux/ashmem.h
+++ b/libc/kernel/common/linux/ashmem.h
@@ -7,40 +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_ASHMEM_H
 #define _LINUX_ASHMEM_H
-
 #include <linux/limits.h>
 #include <linux/ioctl.h>
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ASHMEM_NAME_LEN 256
-
 #define ASHMEM_NAME_DEF "dev/ashmem"
-
 #define ASHMEM_NOT_PURGED 0
 #define ASHMEM_WAS_PURGED 1
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ASHMEM_IS_UNPINNED 0
 #define ASHMEM_IS_PINNED 1
-
 struct ashmem_pin {
  __u32 offset;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u32 len;
 };
-
 #define __ASHMEMIOC 0x77
-
 #define ASHMEM_SET_NAME _IOW(__ASHMEMIOC, 1, char[ASHMEM_NAME_LEN])
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ASHMEM_GET_NAME _IOR(__ASHMEMIOC, 2, char[ASHMEM_NAME_LEN])
 #define ASHMEM_SET_SIZE _IOW(__ASHMEMIOC, 3, size_t)
 #define ASHMEM_GET_SIZE _IO(__ASHMEMIOC, 4)
 #define ASHMEM_SET_PROT_MASK _IOW(__ASHMEMIOC, 5, unsigned long)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ASHMEM_GET_PROT_MASK _IO(__ASHMEMIOC, 6)
 #define ASHMEM_PIN _IOW(__ASHMEMIOC, 7, struct ashmem_pin)
 #define ASHMEM_UNPIN _IOW(__ASHMEMIOC, 8, struct ashmem_pin)
 #define ASHMEM_GET_PIN_STATUS _IO(__ASHMEMIOC, 9)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ASHMEM_PURGE_ALL_CACHES _IO(__ASHMEMIOC, 10)
-
 #endif