anti-dilution provisions

Anti-dilution provisions provide existing preferred shareholderswith an adjustment to the number of shares they hold (an increase) if the company raises money at a share price below the share price at which the existing preferred shareholders purchased their stock.  Basically it is a form of insurance that if the company needs to raise additional money and can only do so at a lower price than that at which the existing shareholders purchased their stock, it will need to increase the number of shares of stock it grants to existing shareholders as compensation. 

Video 

Anti Dilution Provision