Social extensions were the most significant addition to version 3.6.

Other than that there have been no significant additions to the building.

A significant addition and remodel to the school building began during the summer of 2012.

A number of significant additions were made in the 1970s.

Another significant addition was a comic in the middle of the magazine.

That has been the only significant addition or alteration to the building.

Today, the team made perhaps its most significant addition in recent memory.

This book is the most significant addition to the night climbing literature that has been published in recent years.

The last significant addition was the toilet and kitchen extension added in 1971.

The most significant addition to the fighting system, is the "defense" button.