Oops, we forgot to amend the Plan

[Guest PBJ]

Hello

Employer implemented Roth contributions into its 401(k) plan effective March 1, 2007. The participants were notified in December 2006 and the SPD was updated and distributed in February 2007. Participants have been making roth contributions, no problems there. However, the amendment implementing the Roth feature was not signed. In fact, the TPA just sent over the amendment (over a year later). I don't suppose that I can just have the amendment signed? I guess some type of correction in needed -- what do I do?

Thanks