The silkscreen is a helpful tool in identifying components on the board. During PCB layout it should be designed for a consistent flow that allows easy identification of parts while using a minimum of leaders in difficult areas. Special care should be taken to ensure that each device has its appropriate associated markings, such as polarity, pin #1 location, 10th pin marker for fine pitch parts, or connector pinouts. Some parts may require additional labeling that should be specified by the customer. This may include labeling connectors, LEDs, switches, high voltage areas, or critical circuits (see the figure below).