Readme doesn't instruct to re-register builder post meta for custom module

I added a custom module as the Readme instructed, but I wasn't able to see this new module until I

`
$plugin->register_builder_post_meta( 'modular-page-builder', array(
'title' => __( 'Page Body Content' ),
'api_prop' => 'page_builder',
'allowed_modules' => array( 'header', 'text', 'image', 'video', 'blockquote', ''),
) );
`

Perhaps I did it the wrong way, but the Readme wasn't too exhaustive in how to add this custom module.