diff --git a/doc/salome/gui/SMESH/input/removing_nodes_and_elements.doc b/doc/salome/gui/SMESH/input/removing_nodes_and_elements.doc
index 0a48ee65e..873ccd5f5 100644
--- a/doc/salome/gui/SMESH/input/removing_nodes_and_elements.doc
+++ b/doc/salome/gui/SMESH/input/removing_nodes_and_elements.doc
@@ -122,8 +122,16 @@ button in the toolbar. You can also right-click on the mesh in the
 Object Browser and select Clear Mesh Data in the pop-up menu.</li>
 </ol>
 
+<center>
 \image html mesh_clear.png
-<center><em>"Clear Mesh Data" button</em></center>
+<em>"Clear Mesh Data" button</em></center>
+
+\note This command works different in following situations: <ul>
+  <li> if a mesh is computed on geometry, then "Clear Mesh Data" removes
+    all elements and nodes.</li>
+  <li> if mesh is not based on geometry (imported, compound, created from
+    scratch etc), then "Clear Mesh Data" removes only elements and
+    nodes computed by algorithms, i.e. it can remove nothing.</li></ul>
 
 
 <br><b>See Also</b> a sample TUI Script of a