woocommerce add notes under a field on checkout page
<p>I need some help from Woocommerce ninjas out there.</p>

<p>Is there any way to put some text under fields on woocommerce checkout page?</p>

<p><a href="https://i.stack.imgur.com/VxURk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VxURk.png" alt="enter image description here"></a></p>

<p>I know some filter hook I might use but no options like <code>footnote</code>...</p>

<pre><code>// Hook in
add_filter( 'woocommerce_billing_fields' , 'custom_override_checkout_fields' );

// Our hooked in function - $fields is passed via the filter!
function custom_override_checkout_fields( $fields ) {
     // something like footnote???
     $fields['billing_first_name']['footnote'] = 'little footnote text right here!!';
     return $fields;
}
</code></pre>

<p>Any idea??</p>