The Basel Committee on Banking Supervision made some significant changes to the financial rules of the road today. For the first time ever, banks in the world’s 20 biggest economies will have to hold a certain amount of cash or assets in case of a crisis.

Marketplace’s Stephen Beard breaks it down like this: “This is designed so that people don’t form lines five times around the block, because they’ll know that the bank has enough money to pay them off if they want their money back,” said Beard.

Should account holders be worried? Beard says probably not, because there is no sign of bank runs in our future.