-<li><b>Into 5 tetrahedra</b>, <b>Into 6 tetrahedra</b> and <b>Into 24 tetrahedra</b> allows to
-specify the number of tetrahedra a hexahedron will be split into. If the specified method does
-not allow to get a conform mesh, a generic solution is applied: an additional node
-is created at the gravity center of a hexahedron, serving an apex of tetrahedra, all quadrangle sides of the hexahedron are split into two triangles each serving a base of a new tetrahedron.</li>
-</ul>
-
+<li><b>Into N tetrahedra/prisms</b> allows to specify the number of
+ tetrahedra or prisms a hexahedron will be split into. If the
+ specified method does not allow to get a conform mesh, a generic
+ solution is applied: an additional node is created at the gravity
+ center of a hexahedron, serving an apex of tetrahedra, all
+ quadrangle sides of the hexahedron are split into two triangles each
+ serving a base of a new tetrahedron.</li>
+<li> <b> Facet to split </b> group allows to specify a side (facet) of a
+ hexahedron to split into triangles when splitting into prisms.
+ The facet to split is defined by specifying a point and a direction
+ close to normal of the facet. The operation finds a hexahedron most
+ close to the specified point and splits a facet whose normal is most
+ close to the specified direction. Then the splitting is propagated
+ from that hexahedron to all adjacent hexahedra.
+ <ul>
+ <li> <b> Hexa location </b> allows to specify a <em> start
+ point </em> by which a first split hexahedron is found. <em>
+ Selection button</em> switches to selection of the element whose
+ barycenter will be used the start point and whose direction will be
+ used as a normal to facet to split into triangles. To return to
+ selection of volumes to split it is necessary to switch this button
+ off. </li>
+ <li> <b> Facet normal </b> allows to specify a direction of the
+ normal to hexahedron facet to split into triangles.</li>
+ </ul>
+<li><b> All domains </b> - if it is off the operation stops as all
+ hehexedra adjacent to the start hexahedron are split into
+ prisms. Else the operation tries to continue splitting starting from
+ another hexahedron closest to the <b> Hexa location</b>. </li>