--- /dev/null
+.. _over_constrained_volumes_page:
+
+************************
+Over-constrained volumes
+************************
+
+This mesh quality control highlights volumes sharing only one border with other volumes.
+In other words, the volumes having all their nodes on the external border of the mesh are highlighted.
+
+.. note::
+ The highlighted volumes are actually over-constrained only if, at the computation time, the boundary conditions on the borders where the nodes are located are all Dirichlet boundary conditions.
+
+.. image:: ../images/over_constrained_volumes.png
+ :align: center
+
+.. centered::
+ In this picture the over-constrained volume is displayed in red.
+
+**See Also** a sample TUI Script of a :ref:`tui_over_constrained_volumes` filter.
+
+
