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-rw-r--r--doc/refman.tex10
1 files changed, 8 insertions, 2 deletions
diff --git a/doc/refman.tex b/doc/refman.tex
index aa321a9..9aa43be 100644
--- a/doc/refman.tex
+++ b/doc/refman.tex
@@ -3506,8 +3506,14 @@ attribute has priority over the \attributeref{arc}{fillcolor} attribute and the
\object{curve}
- Items of type \ident{curve} display a path of line segments and/or cubic bezier connected
- by their end points. The polygon delimited by the path can optionally be filled.
+ Items of type \ident{curve} display pathes of line segments and/or cubic bezier connected
+ by their end points. A cubic Bezier is defined by four points. The first and last
+ ones are the extremities of the cubic Bezier. The second and the third ones are control point
+ (i.e. they must have a third ``coordinate'' with the value 'c'). If both control points
+ are identical, one may be omitted. As a consequence, it is an error to have more than
+ two succcessive control points or to start or finish a curve with a control point.
+
+ The polygon delimited by the path can optionally be filled.
It is possible to build curve items with more than one path to
describe complex shapes with the \cmdref{contour} command. This command can be used to
perform boolean operations between a curve and almost any other item available in TkZinc