code: func (tab *Table) setFallbackNodes(nodes []*enode.Node) error {
  	for _, n := range nodes {
  		if err := n.ValidateComplete(); err != nil {
  			return fmt.Errorf("bad bootstrap node %q: %v", n, err)
  		}
  	}
  	tab.nursery = wrapNodes(nodes)
  	return nil
  }
docs: // setFallbackNodes sets the initial points of contact. These nodes
  // are used to connect to the network if the table is empty and there
  // are no known nodes in the database.