Decided to show post number as well.

homepage/views/guestbook.pug

@@ -39,7 +39,7 @@ block content
 			each post in posts
 				article
 					header
-						| Posted by #[span.highlighted= post.name] #{post.website} on #[time(datetime=post.created)= date_(post.created, tz)]
+						| Post ##{post.post_id} by #[span.highlighted= post.name] #{post.website} on #[time(datetime=post.created)= date_(post.created, tz)]
 					each line in post.message.split("\n")
 						+entryLine(line)
 					if post.feedback