diff --git a/EXeExecutor.h b/EXeExecutor.h
index e68e9a7..9f52c60 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -734,6 +734,7 @@ EXE_EXPORT bool ExeSurfIsClosed( int nId) ;
 EXE_EXPORT bool ExeSurfVolume( int nId, double& dVol) ;
 EXE_EXPORT bool ExeSurfFrNormVersor( int nId, int nRefId, Vector3d& vtNorm) ;
 EXE_EXPORT bool ExeSurfFrGrossArea( int nId, double& dArea) ;
+EXE_EXPORT bool ExeSurfFrChunkMaxOffset( int nId, int nChunk, double& dMaxOffset) ;
 EXE_EXPORT bool ExeSurfFrTestExternal( int nId1, int nId2, double dMinDist) ;
 EXE_EXPORT int  ExeSurfFrChunkCount( int nId) ;
 EXE_EXPORT int  ExeSurfFrChunkSimpleClassify( int nId1, int nChunk1, int nId2, int nChunk2, double dToler = 0) ;