How do you add instructions to the featured image field (see attached screenshot) - something like: "recommended dimensions - H980px by W450px"..?

How do you add instructions to the featured image field (see attached screenshot) - something like: "recommended dimensions - H980px by W450px"..?

• images
• post-thumbnails

Share Improve this question asked Jul 6, 2020 at 11:20 jenojeno 4866 bronze badges 2

• Looks like this is possible but requires a bit of cide, are you able to edit your functions.php or setup a new plugin to do this? – mozboz Commented Jul 6, 2020 at 12:10
• @mozboz yes, I can edit my functions.php file – jeno Commented Jul 6, 2020 at 13:28

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1 Answer 1

Sorted by: Reset to default 3

Wordpress has a hook for that. Here is a sample code:

function featured_image_dimensions( $content, $post_id, $thumbnail_id ){
    $help_text = '<p>' . __( 'recommended dimensions - H980px by W450px', 'my_domain' ) . '</p>';
    return $help_text . $content;
}
add_filter( 'admin_post_thumbnail_html', 'featured_image_dimensions', 10, 3 );

Add this code to your functions.php and you should be good to go.