FLSA section 18B, added to the labor statute by the Patient Protection and Affordable Care Act (PPACA), requires employers that are subject to the FLSA (most employers) to provide to each of their employees, and to all new employees at the time of hiring, a written notice. The notice is to remind employees of the availability of the health insurance exchange.
The notice must be provided to each employee, regardless of plan-enrollment status or part-time or full-time status. Employers are not required to provide a separate notice to dependents or retirees, but an employer's obligation to provide the notice may extend to its independent contractors and leased workers, depending on the nature of their relationship with the employer as determined under the FLSA's "economic reality" test. Below is a link for a Model Notice that can be used to satisfy the requirement.
http://www.dol.gov/ebsa/pdf/FLSAwithplans.pdf