diff --git a/EXeExecutor.h b/EXeExecutor.h
index df8ac11..e42db12 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -743,6 +743,7 @@ EXE_EXPORT int  ExeSurfTmFacetCount( int nId) ;
 EXE_EXPORT int  ExeSurfTmPartCount( int nId) ;
 EXE_EXPORT bool ExeSurfTmGetVertex( int nId, int nVert, int nRefId, Point3d& ptVert) ;
 EXE_EXPORT bool ExeSurfTmGetNearestVertex( int nId, const Point3d& ptNear, int nRefId, int& nVert, Point3d& ptVert) ;
+EXE_EXPORT bool ExeSurfTmTriangleNormVersor( int nId, int nTria, int nRefId, Vector3d& vtNorm) ;
 EXE_EXPORT int  ExeSurfTmFacetFromTria( int nId, int nT) ;
 EXE_EXPORT bool ExeSurfTmFacetAdjacencies( int nId, int nFacet, INTMATRIX& vAdj) ;
 EXE_EXPORT bool ExeSurfTmFacetNearestEndPoint( int nId, int nFacet, const Point3d& ptNear, int nRefId,