This Supplement is filed pursuant to Rule 497(d) with regard to
Government Securities Income Fund U.S. Treasury Strategy Trust - 1,
Defined Asset Funds.
The text of the supplement to the Prospectus dated September 8, 1995
is as follows:
Supplement dated October 26, 1995
to Prospectus dated September 8, 1995 of
Government Securities Income Fund
U.S. Treasury Strategy Trust - 1
Defined Asset Funds
-------------------------------------
The last two paragraphs under the caption "Distributions and
Returns" beginning on page 5 of the Prospectus are replaced by the
following:
Estimated Yield to Next Extension Date
Estimated Yield to Next Extension Date shows the net annual yield
to investors from the date of purchase of Units until the Next Extension
Date (i.e., the next date on which approximately 20% of the face value of
the Portfolio matures). Under accepted bond practice, bonds are
customarily offered to investors on a "yield price" basis, which involves
computation of yield to maturity, and which takes into account not only
the interest payable on the bonds but also the amortization or accretion
to a specified date of any premium over or discount from the par
(maturity) value in the bond's purchase price. In calculating Estimated
Yield to Next Extension Date, the average yield for the Portfolio is
derived by weighting each Security's yield by the market value of the
Security (but not by the time remaining to maturity). Once the average
Portfolio yield is computed, this figure is then adjusted for estimated
expenses and the effect of the applicable sales charges paid by
investors. The Estimated Yield to Next Extension Date calculation does not
take into account certain delays in distributions of income and the
timing of other receipts and distributions on Units and may, depending on
maturities, overstate or understate the impact of sales charges. All of
these factors may result in a lower figure.
Estimated Yield to Next Extension Date will vary with the
purchase price of the Units (including sales charges), changes in fund
income and expenses and changes in Portfolio composition (including
dispositions and Extensions of Securities) and the date of purchase of
the Units and therefore can be materially different than any figure
quoted. In addition this figure, may not be directly comparable to
yield figures used to measure other investments, and since it is based
on certain assumptions and variables the actual return received by an
investor may be higher or lower.
