Shortcode after content

add_filter( 'the_content', 'bm_shortcode_after_content' );

function bm_shortcode_after_content( $content ) {
    if ( is_singular('cpt_franchize')) {
        $shortcode = '[contact-form-7 id="364" title="Formularz 1"]'
        $content = $content . do_shortcode($shortcode);
        }
    return $content;
}