diff --git a/doc/salome/gui/SMESH/input/selection_filter_library.doc b/doc/salome/gui/SMESH/input/selection_filter_library.doc
index 12aabc255..583d7e773 100644
--- a/doc/salome/gui/SMESH/input/selection_filter_library.doc
+++ b/doc/salome/gui/SMESH/input/selection_filter_library.doc
@@ -82,6 +82,15 @@ IDs.
 </li><li>
 <b>Color of Group</b> allows selection of entities belonging to the Group with
 the color defined by the <b>Threshold Value</b>.
+</li><li>
+<b>Elements of a domain</b> allows selection of entities belonging to
+one domain of a mesh. The domain is a part of mesh not connected to
+other parts. <b>Threshold Value</b> locating any element of the domain can be either
+- node ID (that you can pick in the Viewer) or
+- geometrical vertex (that you can pick either in the Viewer or in the
+  Object Browser) or
+- 3 coordinates of a point (that you can enter in TUI mode only).
+
 </li>
 </ul>