Custom Post Type Search Bar

Is there a way to build a search bar for a custom post type? www.remarpro.com’s codex has this as the code for the search bar

<form role="search" method="get" id="searchform" action="<?php bloginfo('url'); ?>">
    <div><label class="screen-reader-text" for="s">Search for:</label>
        <input type="text" value="" name="s" id="s" />
        <input type="submit" id="searchsubmit" value="Search" />
    </div>
</form>

I tried replacing the bloginfo(‘url’) with the slug url for my custom post types, but nothing. Any ideas?