-User can build the dependency tree with new main objects by selecting
-them in Object Browser, in OCC Viewer or in Dependency Tree Viewer
-and calling corresponding popup menu. When invoked, this menu item
-will open a 2D view window and display a dependency tree for the
-selected object or objects (multiple selection is supported).
+In order to better understand the relations between the %GEOM
+objects in a study the user has a possibility to display the
+ascendants and descendant of the object(s) in a family tree.
+
+User can build the dependency tree by selecting desirable object
+in Object Browser or OCC Viewer and calling "Show dependency tree"
+popup item. It will open a new or clear the existing "Dependency
+Tree" view window (only one view is supported) and display a
+dependency tree for the selected object or objects (multiple
+selection is supported). Also user can rebuild the tree if to select
+some object(s) right in the "Dependency Tree" view and call
+"Rebuild the tree" popup menu item.