Method Only

@Override
    public void addInformation(ItemStack itemstack, EntityPlayer player, List par3list, boolean par4) {
         if(GuiScreen.isShiftKeyDown()){
                par3list.add("Modifier: 'Blistering'");
                par3list.add("All projectiles from this weapon are on fire.");
                par3list.add("Modifier: 'Splitting'");
                par3list.add("All projectiles fired from this weapon get split into 3.");
            }else{
                par3list.add("Hold shift for modifier list.");
            }
    }