HBO and AT&T have struck what they are calling a “historic” first-ever affiliate pact that secures carriage for a channel across linear TV, online and authenticated streaming all at once.

They also announced that the premium network will join the telco’s upcoming streaming bundle DirecTV Now as part of a multi-platform deal the companies announced late Friday.

“Our agreement with HBO is groundbreaking in the pay TV and wireless industries as well as the premium category,” said Dan York, chief content officer for AT&T in a statement. “This is a first-of-its-kind deal for both companies and a big win for consumers.”

That makes HBO the second known entry to DirecTV Now, which is expected to launch by the end of the year. Disney announced earlier this month that ESPN would also be part of the service, which is expected to be in the vein of rival Dish’s Sling TV, though full details aren’t yet known as to what the AT&T product will be.

The DirecTV Now deal is part of a broader agreement between the companies that will keep HBO on other AT&T video platforms including DirecTV and U-Verse.

“We are thrilled to extend and deepen our valued and long-standing relationship with AT&T by announcing this groundbreaking agreement,” said Simon Sutton, president of global distribution at HBO.