diff --git a/Casting_2/doc/Casting_2/Casting_2.txt b/Casting_2/doc/Casting_2/Casting_2.txt
index c62334deedd..b960f76917b 100644
--- a/Casting_2/doc/Casting_2/Casting_2.txt
+++ b/Casting_2/doc/Casting_2/Casting_2.txt
@@ -25,11 +25,11 @@ freedom), the number of objects involved grows, or the shape of the
 objects becomes more complicated.
 
 This package provides a function called
-`single_mold_translational_casting_2()` that given a simple polygon
-\f$P\f$ it determines whether a cavity (of a mold in the plane) that
-has the shape of \f$P\f$ can be used so that the polygon \f$P\f$ could
-be pulled out of the mold without colliding into the mold (but
-possibly sliding along the mold surface); see
+`single_mold_translational_casting_2()` that given a simple closed
+polygon \f$P\f$ it determines whether a cavity (of a mold in the
+plane) that has the shape of \f$P\f$ can be used so that the polygon
+\f$P\f$ could be pulled out of the mold without colliding into the
+mold (but possibly sliding along the mold surface); see
 \cgalFigureRef{casting_2_fig_mold} for an illustration. If the polygon
 is <em>castable</em>, the function computes the set of top edges of
 such cavities and the corresponding closed ranges of pull