Need to add query string to end of URL via Mod Rewrite

I need to setup my .htaccess file with a rule that rewrites all visits to www.site.com/feed (with or without trailing slash) to www.site.com/feed?w=1

I've attached my current .htaccess contents below.

php_value memory_limit 128M
 
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
 
AddHandler php5-script .php

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