NBC renews 'Marriage Ref' for season two

NBC has ordered a second season of The Marriage Ref.

According to The Hollywood Reporter, the network renewed the Jerry Seinfeld-produced reality series for a 13-episode season two.

The broadcaster also ordered more episodes of Minute to Win It and Who Do You Think You Are?.

Ref features a panel of celebrities commenting on the married lives of average Americans.

The programme has averaged 7.2 million viewers in its Thursday night timeslot.

"It's doing a good job for us. It's certainly noisy. We've seen the show find its feet," NBC programming executive Paul Telegdy said about the series.

He added: "We think it's a show that's improving, and we've got high hopes for it."

NBC is expected to tweak the show's format as it continues to air.