<PAGE>
MASSACHUSETTS INVESTORS TRUST
Supplement to Part II of the Statement of Additional
Information, dated May 1, 1999
Part II of the Statement of Additional Information, dated May 1, 1999,
for Massachusetts Investors Trust is supplemented by amending the fifth
paragraph on page 12 to read as follows:
From time to time the Fund may also discuss or quote the views of its
distributor, its investment adviser and other financial planning, legal, tax,
accounting, insurance, estate planning and other professionals, or from surveys,
regarding individual and family financial planning. Such views may include
information regarding: retirement planning, including issues concerning social
security; tax management strategies; estate planning; general investment
techniques (e.g., asset allocation and disciplined saving and investing);
business succession; ideas and information provided through the MFS Heritage
PlanningSM program, an intergenerational financial planning assistance program;
issues with respect to insurance (e.g., disability and life insurance and
Medicare supplemental insurance); issues regarding financial and health care
management for elderly family members; the history of the mutual fund industry;
investor behavior; and other similar related matters.