You can download the plugin here, unzip it, upload it to your wp-content/plugins directory and activate it.

How to

Using this plugin is super simple: just add a custom field named cnote to a post/page and enter the content that should appear next to the comment form into its value field.

Here’s an example:

When WordPress renders the page, the plugin will pick up the content of your custom field and display its content next to your comment form. It may look like so:

The plugin expects that you enter some text, so it inserts your content into a p element. This element has got a class cnote helping you to style the notes with CSS.

The code

In case you’re developer and want to know more about the code just have a look at the plugin, it’s really straight forward. What it does is this: look out for a custom field named cnote, if it’s present we’ll output it’s contents otherwise nothing happens.

$note = get_post_meta($post_id, 'cnote', true);
if (empty($note)) return;
echo '<p>', $note, '</p>';

This gets registered with the comment_form action and will be executed once the theme calls this action.

Conclusion

Using custom fields we can add hints to comment forms on a post/page basis. This technique may be really helpful in case you would like to tell the user something special just before he fills out the comment form.