--- /dev/null
+.. _double_nodes_control_page:
+
+************
+Double nodes
+************
+
+This mesh quality control highlights the nodes which are coincident with other nodes (within a given tolerance). Distance at which two nodes are considered coincident is defined by :ref:`dbl_nodes_tol_pref` preference.
+
+.. image:: ../images/double_nodes.png
+ :align: center
+
+In this picture some nodes are coincident after copying all elements with translation.
+
+**See also**: A sample TUI Script of a :ref:`tui_double_nodes_control` filter.
+
+
