Michigan constitution
Article IX
Section 15

The state may borrow money for specific purposes in amounts as may be provided
by acts of the legislature adopted by a vote of two-thirds of the members elected to and serving
in each house, and approved by a majority of the electors voting thereon at any general
election. The question submitted to the electors shall state the amount to be borrowed, the
specific purpose to which the funds shall be devoted, and the method of repayment.