Van Frank Telecommunications has a patent on a cellular transmission process. The company has amortized the patent on a straight-line basis since 2012, when it was acquired at a cost of $9 million at the beginning of that year. Due to rapid technological advances in the industry, management decided that the patent would benefit the company over a total of six years rather than the nine-year life being used to amortize its cost. The decision was made at the end of 2016 (before adjusting and closing entries). Required: Prepare the appropriate adjusting entry for patent amortization in 2016 to reflect the revised estimate