In some cases an employee benefit plan may provide different benefits for various classes of participants and beneficiaries. For example, a plan amendment altering benefits may apply to only those participants who are employees of an employer when the amendment is adopted and to employees who later become participants, but not to participants who no longer are employees when the amendment is adopted. (See § 2520.104b-4). Similarly, a plan may provide for different benefits for participants employed at different plants of the employer, or for different classes of participants in the same plant. In such cases the plan administrator may fulfill the requirement to furnish a summary plan description to participants covered under the plan and beneficiaries receiving benefits under the plan by furnishing to each member of each class of participants and beneficiaries a copy of a summary plan description appropriate to that class. Each summary plan description so prepared shall follow the style and format prescribed in § 2520.102-2, and shall contain all information which is required to be contained in the summary plan description under § 2520.102-3. It may omit information which is not applicable to the class of participants or beneficiaries to which it is furnished. It should also clearly identify on the first page of the text the class of participants and beneficiaries for which it has been prepared and the plan's coverage of other classes. If the classes which the employee benefit plan covers are too numerous to be listed adequately on the first page of the text of the summary plan description, they may be listed elsewhere in the text so long as the first page of the text contains a reference to the page or pages in the text which contain this information. If the plan administrator elects to prepare more than one summary plan description, each such summary plan description shall be filed with the Secretary in the manner provided in § 2520.104a-3(b).