Netflix has expanded its measurement deal with Nielsen, which now includes TV content program data in the United States.

Under the terms of the deal, Netflix will now subscribe to Nielsen’s national TV content measurement and streaming TV data services.

In Mexico and Poland, Netflix will subscribe to cross-platform audience insights — data coming from streaming panels in each market.

In October, Netflix announced a partnership for Nielsen’s Digital Ad Ratings service — for Netflix’s ad-supported option that started up in November. The service measures connected TV, computer and mobile in the U.S. Among other data, it can give advertisers a perspective on potential added reach.

The $6.99-a-month ad-supported package had a bit of a rough start with advertisers — underdelivering on promised viewing.

Netflix had to give back cash to some of its initial advertisers due to an inability to find enough advertising inventory for the high-demand fourth-quarter period, according to media executives.

Reports suggest Netflix was placing a high value for its inventory — at around $65 cost per thousand viewers (CPMs).