diff --git a/EInAPI.h b/EInAPI.h
index b4e0ea0..8dbd2e9 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -411,6 +411,7 @@ 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 EgtGetSurfTmSilhouette( int nId, const double vtDir[3], int nDestGrpId, int nRefType, int* pnCount) ;
 EIN_EXPORT int  __stdcall EgtExtractSurfTmFacetLoops( int nId, int nFacet, int nDestGrpId, int* pnCount) ;
 
 // Geo Snap Vector/Point/Frame