The yard said the customer was Asian and the deal appears to be confirmation of TradeWinds' report that China's Shandong Shipping had added two 84,000-cbm options for $80m each at the yard.
Delivery is set for the second half of 2016.
Shandong now has six vessels on order at DSME.
The options were attached to a deal for four firm VLGCs inked in February.
DSME