diff --git a/EGkSurfBezier.h b/EGkSurfBezier.h
index dcde195..42379b0 100644
--- a/EGkSurfBezier.h
+++ b/EGkSurfBezier.h
@@ -103,6 +103,7 @@ class __declspec( novtable) ISurfBezier : public ISurf
       virtual bool CreateBySetOfCurves( const ICURVEPOVECTOR& vCrvBez, bool bReduceToDeg3 = true) = 0 ;
       virtual bool RemoveCollapsedSpans() = 0 ;
       virtual PNTVECTOR GetAllControlPoints( void) const = 0 ;
+      virtual bool LimitSurfToTrimmedRegion( void) = 0 ;
 } ;
 
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