diff --git a/EGkPolygon3d.h b/EGkPolygon3d.h
index 759f56d..7a028b9 100644
--- a/EGkPolygon3d.h
+++ b/EGkPolygon3d.h
@@ -29,6 +29,7 @@
 class Polygon3d
 {
    public :
+      EGK_EXPORT bool Clear( void) ;
       EGK_EXPORT bool FromRectangle( double dDimX, double dDimY) ;
       EGK_EXPORT bool FromPolyLine( const PolyLine& PL) ;
       EGK_EXPORT bool FromPlaneTrimmedWithBox( const Plane3d& plPlane, const Point3d& ptMin, const Point3d& ptMax) ;