Cablevision Systems will add 15 new high-definition channels from Voom HD Networks beginning June 26. The additions will bring Cablevision’s iO digital cable customers a total of 40 HD channels.

The company also announced that by the end of this year it will have the capability to carry more than 500 channels of HD programming on its advanced fiber optic network.

The channels cover news, travel, and several film categories. Cablevision gives iO customers HD channels without charging an additional fee. It says it is still the only source of HD VOD within its service area. The channels will be located with Cablevision’s other high-definition programming starting on channel 700.