http://www.dol.gov/ebsa/publications/wyskapr.html
Employee Benefits Security Administration, U.S. Department of Labor
An explanation of the role of different federal agencies in regulating pension plans and descriptions of: your employer's obligation (or other appropriate plan official) to provide you with information about the plan; what information must be made available automatically, at regular intervals, and, in many cases, at no cost to you. This booklet also points out the importance of keeping informed on any changes in your plan's rules of operation as well as other vital, related facts.