If a company A buys company B and in the annual report of Company A it says:

Company A will pay $25 million for Company B and may pay an additional $30 million in 2013, depending on the performance of Company B.

Would this mean that in the buying terms and conditions it would state somewhere that if Company B performs really well just after being bought, it is only fair that Company A pay more?

Which forms and filings would I get more information on the terms of acquisition?

Thank you

/dumb investor