Whether you own a business or are entering into some kind of financial agreement unrelated to business, lawyers will tell you to never sign on the dotted line unless you fully understand everything within it. In fact, consulting with family lawyers about financial agreements is the best way to ensure the other person is not taking unfair advantage of you.
Financial agreements can be very simple or they can be much more complicated and you are unlikely to understand the implications of everything you read in it, even if you think it is clear. In business there are many ways of saying things legally that spin the meaning around to give favour to the person who is offering the agreement. Unless you have a lawyer go over it and explain it all to you, it could be that you are disadvantaged in some way.