Need help with invoice term

[CLEMM]

I just made final payment and on the third line down, right under Cruise Fare and Vacation Protection Plan is a line that reads "MZM6-$100 OBC P/S" There is no charge for this and it sort of looks like it might be an OBC but I have no idea for what or from whom. Anyone see this before who can enlighten me?

[travelpig]

Hi, Lucky you, you have a $100 onboard credit the P/S is per stateroom. Your travel agent would be the one giving it to you. Have a great cruise!

[firemanbobswife]

It is $100 On Board Credit Per Stateroom.It was probably a promotion when you booked. Enjoy!

[CLEMM]

Yay for me! Thank you very much for your responses!