<p><strong>Calculation of trees from alignments</strong></p>
<p>Trees are calculated on either the complete alignment, or just the
currently selected group of sequences, using the functions in the
-<strong>Calculate→Calculate tree</strong> submenu. There are
+<strong>Calculate→Calculate tree</strong> submenu.
+Once calculated, trees are displayed in a new <a
+href="../calculations/treeviewer.html">tree viewing window</a>. There are
four different calculations, using one of two distance measures and
constructing the tree from one of two algorithms :
</p>