<ul>
<li>specify the cooordinates of the start \b Point of the vector of revolution;</li>
<li>specify the \b Vector of revolution through the coordinates of its
-end point with respect to the coordinates of the start point;</li>
+end point with respect to the coordinates of the start
+point. Alternatively, it is possible to specify the vector through the
+normal to the selected face.</li>
</ul>
</li>
