An adjustable shelf assembly for a dishwasher system is used to hold cups, bowls, spoons and other crockery items that are placed within the dishwasher. The vertical position of the shelf assembly within the dishwasher tub is adjusted by an adjustment mechanism comprising a carrier and a gripping projection. The gripping projection can move between a gripping position and sliding position. The carrier slides up and down a vertical bar. The adjustable shelf is capable of moving between a stowed position and a deployed position. In the deployed position the shelf can support crockery items. The shelf can be moved and held at any position between the deployed and stowed positions. The shelf assembly includes a cam mechanism that allows the shelf to move between a deployed position and a stowed position. The shelf is partially curved in the stowed position and flexes to become straight in the deployed position.