[CentOS] selinux-policy update resets /etc/selinux/targeted/contexts/files/file_contexts?

Hi,

On an internal webserver (latest C6) I want smb-access to /var/www/html/
In april I did
     chcon -R -t public_content_rw_t /var/www/html/
     setsebool -P allow_smbd_anon_write 1
     setsebool -P allow_httpd_anon_write 1
     echo "/var/www/html/  -- unconfined_u:object_r:public_content_rw_t:s0" >> /etc/selinux/targeted/contexts/files/file_contexts

After the latest round of updates (including selinux-policy.noarch 0:3.7.19-260.el6_6.1 and selinux-policy-targeted.noarch 0:3.7.19-260.el6_6.1) samba-access to /var/www/html was denied.
Applying the commands above re-enabled samba-access.

Anyone knows how I can configure selinux to remeber this after an update to the policies?

Thanks
Patrick