position of the point on the given edge.
\image html point3.png
-Alternatively, it is possible to define 3D coordinates of the point
+Alternatively, it is possible to define a point by an \b Edge and a \b Length.
+The \b Length defines the position of the point on the given edge. It
+can exceed the length of the edge or be negative. In this case the edge
+is extrapolated along its curve (except for bezier and b-spline
+curves).
+The <b>Start Point</b> defines the direction for the length
+calculation (if not defined, the first vertex of
+Edge is used, else the vertex of Edge closest to StartPoint is used).
+\n <b>TUI Command:</b> <em>geompy.MakeVertexOnCurveByLength(Edge,Length,StartPoint=None).</em>
+\n <b>Arguments:</b> Name + 1 edge + 1 Length + 1 Point.
+
+\image html point3_3.png
+
+It is also possible to define 3D coordinates of the point
projected on the given edge to produce the resulting point.
\n <b>TUI Command:</b> <em>geompy.MakeVertexOnCurveByCoord(Edge,X,Y,Z).</em>
\n <b>Arguments:</b> Name + 1 edge + 3 coordinate values of the
