How to add a new attribute to an existing LDAP objectclass?

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http://serverfault.com – I created a custom LDAP objectClass, but forgot a couple attributes before I added it to my OpenLDAP server. I followed the instructions on this Ubuntu doc page: https://help.ubuntu.com/12.04/serverguide/openldap-server.html I am running Ubuntu 12.04. So, how do I add a new MAY attribute to an objectClass that is already applied to the server? Specifically on OpenLDAP, but it would be good to know how for Novell eDirectory as well. (HowTos)