This supplement is filed pursuant to Rule 497(d) with regard
to Defined Asset Funds - Municipal Investment Trust Fund, Insured
Series - 187. The text of the supplement to the Prospectus dated
April 15, 1994 is as follows:
Supplement dated June 1, 1994
to Prospectus of Series of
Municipal Investment Trust Fund
Effective immediately, the quantity discount to sales
charges will apply to all purchases of Municipal Investment
Trust Fund units in the secondary market on the same day,
irrespective of any differences in their rates of Effective
Sales Charge. The limitation to a range of 0.5%, described
under Public Sale of Units - Public Offering Price, has been
eliminated.
