what does "Money added" mean?

[mmorri12]

While reading the billiards magazines tournament section, I always notice the term "money added". I thought I knew what that meant (by money has been added to a pot to increase the take) but then I see guarantee $500 money added tournaments and now I am not sure. I'm just curious if anyone can explain. Thanks.

Some places add money based on the number of players who sign up.
Other guarantee that the money will be added regardless of the number of players that sign up.