Vanguard Total Bond Market II Idx I

The fund employs an indexing investment approach designed to track the performance of the Bloomberg U.S. Aggregate Float Adjusted Index. It invests by sampling the index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full index in terms of key risk factors and other characteristics. The fund invests at least 80% of its assets in bonds held in the index.