WordPress at a glance
filter is not described

comment_post_redirect filter-hook . WP 2.0.5

Filters the location URI to send the commenter after posting.

Usage

add_filter( 'comment_post_redirect', 'filter_function_name_5192', 10, 2 );
function filter_function_name_5192( $location, $comment ){
	// filter...

	return $location;
}
$location(string)
The 'redirect_to' URI sent via $_POST.
$comment(WP_Comment)
Comment object.

Where the hook is called

In file: /wp-comments-post.php
comment_post_redirect
wp-comments-post.php 60
$location = apply_filters( 'comment_post_redirect', $location, $comment );

Where the hook is used (in WP core)

Does not used.