Change name of custom post type archive

I have a custom post type acme_reviews. I’ve namespaced it as suggested in tutorials to prevent future conflicts. But I want its archive page to simply be acme.com/reviews, not acme.com/acme_reviews. How do I achieve this? This is my code:

function create_reviews_post_type() {
    register_post_type('acme_reviews', array(
        'labels' => array(
            'name' => __('Reviews'),
            'singular_name' => __('Review')
            ),
        'menu_position' => 5,
        'public' => true,
        'has_archive' => true,
        )
    );
}
add_action('init', 'create_reviews_post_type');

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The register_post_type has_archive option also accepts a string. That string will be used for the archives. See the changes in the code below:

function create_reviews_post_type() {
    register_post_type('acme_reviews', array(
        'labels' => array(
            'name' => __('Reviews'),
            'singular_name' => __('Review')
            ),
        'menu_position' => 5,
        'public' => true,
        'has_archive' => 'reviews',
    );
}
add_action('init', 'create_reviews_post_type');

According to the codex (and what works for me!) is to just use a rewrite in the array. Both options work but wordpress suggests using the rewrite Below is the quote directly from the codex:

has_archive
(boolean or string) (optional) Enables post type archives. Will use $post_type as archive slug by default.

Default: false

Note: Will generate the proper rewrite rules if rewrite is enabled. Also use rewrite to change the slug used.

MAKE SURE TO FLUSH THE PERMALINK RULES.
if this is in a plugin i always suggest adding an init that flushes the rules when the plugin is activated.

Here is the code, notice i customized the function name too for the same reasons that you customize the post name itself.

function create_acme_reviews_post_type() {  //namespaced your function too..
    register_post_type('acme_reviews', array(
        'labels' => array(
            'name' => __('Reviews'),
            'singular_name' => __('Review')
            ),
        'menu_position' => 5,
        'public' => true,
        'has_archive' => true,
        'rewrite' => array( 'slug' => 'reviews' ), //changes permalink structure
        )
    );
}
add_action('init', 'create_acme_reviews_post_type'); //namespaced function call too..