How to .htaccess

[dorje]

Hi all

i want to redirect my non www to www version by htacees and i did it with

RewriteEngine On

RewriteCond %{HTTP_HOST} ^kathmanduclothing.com

RewriteRule (.*) http://www.kathmanduclothing.com$1 [R=301,L]

 

but the problem is Prestashop keeps removing my redirecting code in weeks or days to its default code and makes the domain to non www version again and again which is very bad by seo perspective.

 

So i just want to add this code for permanent . i mean while we generate a new htaccess file i want that code in it as a default and want to stop the prestashop removing the code itself.

 

Please help on this