Coach Bill O'Brien's five-year contract with Penn State allows for the two sides to agree to an extension by 2016, or the year before his contract is up.The contract could then be extended by one to three seasons, according to new details released this week by the university.O'Brien signed the deal Jan. 6, when he was named Joe Paterno's successor at Penn State. The university then had said O'Brien's base salary started at $950,000, with a 5 percent increase each season.Paterno's base compensation started at a little more than $1 million a year -- a relative bargain for a Hall of Fame coach with two national championships and Division I-record 409 victories.Paterno, who died Jan. 22, was diagnosed with lung cancer in November, just days after being fired as coach following 46 seasons. The dismissal came in the aftermath of child sex abuse charges against retired defensive coordinator Jerry Sandusky.