How to set umask for php5-fpm on Debian?

I was able to set the umask for php5-fpm service by editing it's unit.service file as suggested here and here. The complete and working solution for Debian 8 is this:

1. Manually edit /etc/systemd/system/multi-user.target.wants/php5-fpm.service file and add UMask=0002 line inside [Service] section.
2. Run command systemctl daemon-reload
3. Run command systemctl restart php5-fpm.service

Now the service file looks like this:

[Unit]Description = The PHP FastCGI Process ManagerAfter = network.target[Service]Type = notifyPIDFile = /var/run/php5-fpm.pidExecStartPre = /usr/lib/php5/php5-fpm-checkconfExecStart = /usr/sbin/php5-fpm --nodaemonize --fpm-config /etc/php5/fpm/php-fpm.confExecReload = /bin/kill -USR2 $MAINPID; Added to set umask for files created by PHPUMask = 0002[Install]WantedBy = multi-user.target

Note that:

1. You can not use systemctl edit php5-fpm.service command as edit option was introduced in systemctl version 218 but Debian 8 ships with version 215.
2. Adding *.conf file as suggested in comments for this answer did not work for me, but maybe I messed up something (comments are welcome for this as editing unit file is not something that I feel comfortable with).