- <li>If you activate <b>Generate Groups</b> check-box, the created
- elements contained in groups will be included into new groups named
- by pattern "<old group name>_extruded" and "<old group name>_top".</li>
+ <li>If you activate <b>Generate Groups</b> check-box, the <em>result elements</em>
+ created from <em>extruded elements</em> contained in groups will be
+ included into new groups named by pattern "<old group
+ name>_extruded" and "<old group name>_top". For example if an
+ extruded quadrangle is included in \a Group_1 group then result
+ hexahedra will be included in \a Group_1_extruded group and a
+ quadrangle created at the "top" of extruded mesh will
+ be included in \a Group_1_top group. <br>This check-box is active
+ only if there are some groups in the mesh.</li>