diff --git a/EGkPolyLine.h b/EGkPolyLine.h
index 34c11e6..4a8e956 100644
--- a/EGkPolyLine.h
+++ b/EGkPolyLine.h
@@ -112,6 +112,11 @@ class PolyLine
       EGK_EXPORT bool GetConvexHullXY( PNTVECTOR& vConvHull) const ;
       EGK_EXPORT bool GetMinAreaRectangleXY( Point3d& ptCen, Vector3d& vtAx, double& dLen, double& dHeight) const ;
 
+   private :
+      bool MyChangeStartOnMiddle( void) ;
+      bool MyApproxOnSide( const Vector3d& vtN, bool bLeftSide, double dToler = EPS_SMALL) ;
+      bool MyMakeConvex( const Vector3d& vtN,  bool bLeftSide) ;
+
    private :
       int      m_nRejected ;
       PNTULIST m_lUPoints ;