bind9: dir for files with dynamic updates

[Sergey Matveychuk]

Hi.

As I can see there is a directory for dynamic updates: 
/var/named/etc/namedb/dynamic.

But files with dynamic updates still placed next to zones files 
(/var/named/etc/namedb/master).

I've looked for an option for it in documentation but failed.
So, how can I use /var/named/etc/namedb/dynamic?

--
Sem.