使用mkisofs在自定义Kickstart ISO中包含其他文件和文件夹

I'm unable to figure out how to include some directories and files that I've added to my custom CentOS 6.4 32 bit kickstart install. Is there a way to add these custom directories/files to my output iso (mycustom.iso) using mkisofs or kickstart?I'm unable to figure out how to include some di