diff --git a/EInAPI.h b/EInAPI.h
index dd183f3..147b1bf 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -426,6 +426,7 @@ EIN_EXPORT BOOL __stdcall EgtTrimCurveStartEndAtParam( int nId, double dParS, do
 EIN_EXPORT BOOL __stdcall EgtExtendCurveStartByLen( int nId, double dLen) ;
 EIN_EXPORT BOOL __stdcall EgtExtendCurveEndByLen( int nId, double dLen) ;
 EIN_EXPORT BOOL __stdcall EgtTrimExtendCurveByLen( int nId, double dLen, const double ptNear[3], int nRefType) ;
+EIN_EXPORT int  __stdcall EgtTrimCurveWithRegion(  int nCrvId, int nRegId, BOOL bInVsOut, BOOL bOn, int* pnCount) ;
 EIN_EXPORT int  __stdcall EgtSplitCurve( int nId, int nParts) ;
 EIN_EXPORT int  __stdcall EgtSplitCurveAtPoint( int nId, const double ptOn[3], int nRefType) ;
 EIN_EXPORT BOOL __stdcall EgtModifyCircleCP( int nId, const double ptOn[3], int nRefType) ;