_e function .. simple qiestion

Hi,

I have code in function.php

<?php _e('said', 'your-theme'); ?>

can you just tell me do I need to change “your-theme” to my theme name? for example my theme name is testtheme, root is wp-content/themes/testtheme and code need to be

<?php _e('said', 'testtheme'); ?>

Or I can leave “your-theme”?