diff --git a/EInAPI.h b/EInAPI.h
index 228ab6e..5f83870 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -554,6 +554,7 @@ EIN_EXPORT BOOL __stdcall EgtCurveSelfIntersCount( int nId, int* pnCount) ;
 EIN_EXPORT BOOL __stdcall EgtCurveMinAreaRectangleXY( int nId, int nRefId,
                                           double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3], double* pdDimX, double* pdDimY) ;
 EIN_EXPORT int  __stdcall EgtClosedCurveClassify( int nId1, int nId2) ;
+EIN_EXPORT int  __stdcall EgtCurveWithRegionClassify( int nCurveId, int nRegionId) ;
 EIN_EXPORT BOOL __stdcall EgtArcRadius( int nId, double* pdRad) ;
 EIN_EXPORT BOOL __stdcall EgtArcAngCenter( int nId, double* pdAngDeg) ;
 EIN_EXPORT BOOL __stdcall EgtArcDeltaN( int nId, double* pdDeltaN) ;