After breaking through their bonus pool on the first day of the international signing period, the Astros as expected continue to add to their 2016-17 class.

The team on Saturday signed 22-year-old Cuban shortstop Anibal Sierra for a signing bonus worth $1.5 million, according to a source with knowledge of the deal. Sierra had been linked to the Astros dating to April, although multiple reports pegged the agreed bonus at $3.5 million.

In actuality, the Astros' signing of Sierra is a $3-million investment because of the 100-percent overage tax attached when a team exceeds its international bonus pool. Sierra, listed at 6-foot-1 and 183 pounds, will report to the organization's complex in the Dominican Republic.