diff --git a/src/Extrema/Extrema_ExtSS.hxx b/src/Extrema/Extrema_ExtSS.hxx
index 64956956c7..da4785d671 100644
--- a/src/Extrema/Extrema_ExtSS.hxx
+++ b/src/Extrema/Extrema_ExtSS.hxx
@@ -63,7 +63,7 @@ public:
   //! Returns True if the distances are found.
   Standard_EXPORT Standard_Boolean IsDone() const;
   
-  //! Returns True if the curve is on a parallel surface.
+  //! Returns True if the surfaces are parallel
   Standard_EXPORT Standard_Boolean IsParallel() const;
   
   //! Returns the number of extremum distances.
diff --git a/src/GeomAPI/GeomAPI_ExtremaCurveCurve.hxx b/src/GeomAPI/GeomAPI_ExtremaCurveCurve.hxx
index 9aa545c0f9..20c3d6d601 100644
--- a/src/GeomAPI/GeomAPI_ExtremaCurveCurve.hxx
+++ b/src/GeomAPI/GeomAPI_ExtremaCurveCurve.hxx
@@ -125,6 +125,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the two curves are parallel.
+  Standard_Boolean IsParallel() const
+  {
+    return myExtCC.IsParallel();
+  }
   
   //! Returns the points P1 on the first curve and P2 on
   //! the second curve, which are the ends of the shortest
diff --git a/src/GeomAPI/GeomAPI_ExtremaCurveSurface.hxx b/src/GeomAPI/GeomAPI_ExtremaCurveSurface.hxx
index 6e08b14d75..8841367ee7 100644
--- a/src/GeomAPI/GeomAPI_ExtremaCurveSurface.hxx
+++ b/src/GeomAPI/GeomAPI_ExtremaCurveSurface.hxx
@@ -127,6 +127,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the curve is on a parallel surface.
+  Standard_Boolean IsParallel() const
+  {
+    return myExtCS.IsParallel();
+  }
   
   //! Returns the points PC on the curve and PS on the
   //! surface, which are the ends of the shortest extremum computed by this algorithm.
diff --git a/src/GeomAPI/GeomAPI_ExtremaSurfaceSurface.hxx b/src/GeomAPI/GeomAPI_ExtremaSurfaceSurface.hxx
index 894dc85f9e..86e9f90af0 100644
--- a/src/GeomAPI/GeomAPI_ExtremaSurfaceSurface.hxx
+++ b/src/GeomAPI/GeomAPI_ExtremaSurfaceSurface.hxx
@@ -128,6 +128,12 @@ Standard_EXPORT operator Standard_Integer() const;
   //! 1,NbExtrema ], where NbExtrema is the
   //! number of extrema computed by this algorithm.
   Standard_EXPORT Standard_Real Distance (const Standard_Integer Index) const;
+
+  //! Returns True if the surfaces are parallel
+  Standard_Boolean IsParallel() const
+  {
+    return myExtSS.IsParallel();
+  }
   
   //! Returns the points P1 on the first surface and P2 on
   //! the second surface, which are the ends of the