diff --git a/EGkOffsetCurve3d.h b/EGkOffsetCurve3d.h
index cf352ba..42d784e 100644
--- a/EGkOffsetCurve3d.h
+++ b/EGkOffsetCurve3d.h
@@ -40,6 +40,11 @@ struct OffsetSegm {
 
 typedef std::vector<OffsetSegm> OFFSETSEGVEC ;
 
+enum OFFTYPE {
+   GEOM = 0,
+   PLANECUT = 1,
+};
+
 struct EditCrvInfo {
    enum EditFlag {
       NOEDIT = 0,
@@ -73,7 +78,10 @@ public:
 
 typedef std::vector<Cyl> CYLVECT ;
 
+
 EGK_EXPORT bool CalcAdjustConcavePartsInPath( const ICurveComposite* pCrv, const OFFSETSEGVEC& vOffsetCrvs, double dRad, EDITCRVINFOVEC& vEditInfo) ;
+EGK_EXPORT bool CalcAdjustConcavePartsPlaneCut( const ICurveComposite* pCrv, const PNT5AXVECTOR& vPnt5Ax, const OFFSETSEGVEC& vOffsetCrvs,
+                                                double dRad, EDITCRVINFOVEC& vEditInfo) ;
 EGK_EXPORT bool IsPointInsideCylinder( const Point3d& ptTest, const Cyl& offCyl, double dLinTol) ;
 
 //----------------------------------------------------------------------------