Add trailing slash to domain name

Good afternoon!

I need add trailing slash to domain name. For example: from http://www.domain.com to http://www.domain.com/. I try to add settings to .htaccess:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ /$1/ [L,R=301]

but WordPress trims trailing slash only in domain name, other addresses work fine: http://www.domain.com/dir – http://www.domain.com/dir/

Best regards, Deifinger!