Scotline has taken up an option for a second newbuild with the Royal Bodewes Group.
The original contract for a 4,785DWT containership, was announced in March.
The vessels will have a length of 89.98 metres, a beam of 15.2 metres and a maximum sailing draught of 5.68 metres.
Scot Explorer will be powered by an MaK engine.
The vessel is expected to be launched in the third quarter of 2019.