220 ILCS 66/4

After the 90th day following the effective date of this act, every telephone directory thereafter published for distribution to the members of the general public shall contain a notice which explains this law, such notice to be printed in type which is no smaller than any other type on the same page and to be preceded by the word "WARNING". The provisions of this section shall not apply to those directories distributed solely for business advertising purposes, commonly known as classified directories.