<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>
<li>activate <b>Generate Groups</b> checkbox to copy the groups of
elements of the source mesh to the newly created one. </li>
</li>
+</ul>
<li>Click \b Apply or <b> Apply and Close</b> button to confirm the
operation.</li>
