What does the + mean in the ACL output of "ls -l"?

Question

ls -l

-rwxr-xr-x  1 root     root   885 2010-07-08 13:55 /etc/backup-number-of-files*
-rwxrwxr-x+ 1 levchuk  Users 1067 2010-08-30 14:37 /etc/backup-running-time*

Please notice the + on the 2nd line.