diff --git a/EInAPI.h b/EInAPI.h
index 22a4b12..ae61ebc 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -400,6 +400,10 @@ EIN_EXPORT BOOL __stdcall EgtMergeCurvesInCurveCompo( int nId, double dLinTol, B
 // GeomDb Surf Modify
 EIN_EXPORT BOOL __stdcall EgtInvertSurface( int nId) ;
 EIN_EXPORT int  __stdcall EgtExplodeSurface( int nId, int* pnCount) ;
+EIN_EXPORT BOOL __stdcall EgtSurfFrAdd( int nId1, int nId2) ;
+EIN_EXPORT BOOL __stdcall EgtSurfFrSubtract( int nId1, int nId2) ;
+EIN_EXPORT BOOL __stdcall EgtSurfFrIntersect( int nId1, int nId2) ;
+EIN_EXPORT BOOL __stdcall EgtSurfFrOffset( int nId, double dDist, int nType) ;
 EIN_EXPORT int  __stdcall EgtExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int* pnCount) ;
 EIN_EXPORT int  __stdcall EgtExtractSurfTmFacetLoops( int nId, int nFacet, int nDestGrpId, int* pnCount) ;