<b>Threshold Value</b>. See also a
\ref length_2d_page "Length 2D quality control".
</li><li>
-<b>Coplanar faces</b> selects mesh faces neighboring the one defined by
-<b>Threshold Value</b> and whose normal has an angle less then an
-angular tolerance (defined in degrees) with normal of the face
-selected as threshold. Selection continues among neighboring faces of already
+<b>Coplanar faces</b> selects mesh faces neighboring the one selected
+by ID in <b>Threshold Value</b> field, if the angle between the
+normal to the neighboring face and the normal to the selected face is less then the
+angular tolerance (defined in degrees). Selection continues among all neighbor faces of already
selected ones.<br>
</li>
</ul>
