add_post_type_support multiple post types syntax?

I would like to now the syntax for add_post_type_support for multiple post types. So in the code below I would like subtitle support for both custom-post-type-slug1 and custom-post-type-slug2. Can anyone help me how to do that?

function theme_slug_add_subtitles_support() {
	add_post_type_support( 'custom-post-type-slug1', 'subtitles' );
}
add_action( 'init', 'theme_slug_add_subtitles_support' );

Thanks in advance