Discovery Communications recently said it would make a commitment to invest more than the $100 million it had originally agreed to give to the upcoming Oprah Winfrey Network that it co-owns with Oprah Winfrey.

Now, Discovery has revealed in an SEC filing that in return for investing an addional $89 million in OWN, Oprah Winfrey " has agreed to increase her on-air commitment to OWN, including hosting or starring in a show to air on OWN."

The news was reported in Multichannel News. 

Discovery had previously announced that Oprah "would be featured in a primetime travel series, ‘Oprah’s Next Chapter,’ to air two or three times weekly starting in late 2011," the article noted.

The SEC filing also said that OWN would debut on or before January 1, 2011.