Ohio constitution
Article III: executive
Section 8

The governor on extraordinary occasions may convene
the General Assembly by proclamation and shall
state in the proclamation the purpose for which such
special session is called, and no other business shall be
transacted at such special session except that named in
the proclamation or message to the General Assembly
issued by the governor during said special session, but
the General Assembly may provide for the expenses of
the session and other matters incidental thereto.