Post signature showing on excerpt

[David]

David

August 9, 2015 at 12:36 pm

Hello,

I’ve added a simple signature (forum, facebook & twitter link text) to the end of posts by adding the following to custom.php;

add_filter('the_content','add_signature', 1);
function add_signature($text) {
global $post;
if(($post->post_type == 'post'))
$text .= '<div class="signature">MY SIGNATURE HERE</div>';
return $text;
}

which is working fine, but it’s displaying on the blogroll/excerpt before ‘Read More’ and I just want it to display at the end of single posts. Is there any way to hide it from the excerpt, or a better way to add it to the end of every single post entry?

I know there’s a plugin for this, but the site is under heavy strain and I’d rather not use another plugin if I can help it.

Thanks,
David.