of the common edge.
<em>To unite two triangles:</em>
<ol>
<li>From the \b Modification menu choose the <b>Union of two
triangles</b> item or click <em>"Union of two triangles"</em> button
of the common edge.
<em>To unite two triangles:</em>
<ol>
<li>From the \b Modification menu choose the <b>Union of two
triangles</b> item or click <em>"Union of two triangles"</em> button
-<li>Enter the ID of the required edge in the \b Edge field or select
-this edge in the 3D viewer.</li>
+<li>Enter IDs of nodes forming the required edge in the \b Edge field
+ (a couple of node IDs separated by a dash) or select this edge in
+ the 3D viewer.</li>
<br><b>See Also</b> a sample TUI Script of a
\ref tui_uniting_two_triangles "Uniting Two Triangles" operation.
<br><b>See Also</b> a sample TUI Script of a
\ref tui_uniting_two_triangles "Uniting Two Triangles" operation.