If you would like to see acknowledgment comments in the Nagios email alerts that get sent so other admins do not need to login to view the comment.
edit your notification command cfg file and find this line: notify-service-by-email
Right after $SERVICEOUTPUT$\n\n append
"Notes: $SERVICEACKCOMMENT$"
Thats it, reload nagios and your done.
http://nagios.sourceforge.net/docs/2_0/macros.html
