As the number of people who watch TV via streaming services continues to surge, Nielsen will begin to track how many viewers are getting their live TV from Hulu and YouTube, the AP reports.

Both Hulu and YouTube launched live TV services in the spring, with both services priced just under $40 a month. The companies have not provided information on how many people are subscribed, the AP notes.

“Subscribers can stream channels live on laptops, smartphones and elsewhere,” the story reports. “They can also record shows digitally or watch them on demand.”