Recently there has been a lot of talk about Google’s supplemental index. There seems to be some confusion as to what determines if a page gets put into the main results index or the supplemental results index. Recently Matt Cutts, software engineer at Google touched on this issue. In his recent Blog post he talks about how having pages within the supplemental index doesn’t mean there have been penalties applied. The main reasoning behind a particular page being put into supplemental index would be due to its Page Rank. This would mean Google may not be counting the links the page once had or not giving the same weight for those links as before. The solution to having the pages within the supplemental index returned to Google’s main index would be to build high quality links for these pages.