Changes Made in 2.5 Updates?

Hi Guys, I wonder what changes were made to your 2.5 update? I see no change log in the file? What does this code do? <?php /** * catchbox_after_content hook * */ do_action( 'catchbox_after_content' ); ?> </div><!-- #primary --> <?php /** * catchbox_after_primary hook * */ do_action( 'catchbox_after_primary' ); ?> Thank you very much...