diff --git a/Hyperbolic_triangulation_2/TODO b/Hyperbolic_triangulation_2/TODO
index 04db7215e7a..8e893b708a7 100644
--- a/Hyperbolic_triangulation_2/TODO
+++ b/Hyperbolic_triangulation_2/TODO
@@ -1,5 +1,8 @@
 ==== new ====
 
+add missing dual for faces!
+use hyperbolic circumcenter, not Euclidean!!
+
 add Hyperbolic_triangulation_face_base_wth_info_2
 
 add operator == for triangulations
@@ -25,6 +28,8 @@ CK, or at least Cartesian with sqrt (?)
 
 ========== demo
 
+
+
 --- create an adapted Graphicsitem that does not require finite_* stuff. Replace by hyperbolic_*
        => understand apply_to_range
 the graphicsitem should also not require Segment_2 or Line_segment_2 (does it?)
diff --git a/Hyperbolic_triangulation_2/include/CGAL/Hyperbolic_Delaunay_triangulation_traits_2.h b/Hyperbolic_triangulation_2/include/CGAL/Hyperbolic_Delaunay_triangulation_traits_2.h
index bcce67bd2ef..b15221d91b8 100644
--- a/Hyperbolic_triangulation_2/include/CGAL/Hyperbolic_Delaunay_triangulation_traits_2.h
+++ b/Hyperbolic_triangulation_2/include/CGAL/Hyperbolic_Delaunay_triangulation_traits_2.h
@@ -130,7 +130,7 @@ public:
     construct_segment_2_object() const
   { return Construct_hyperbolic_segment_2(); }
   
-  class Construct_circumcenter_2
+  class Construct_hyperbolic_circumcenter_2
   {
   public:
     
@@ -167,10 +167,6 @@ public:
     
   };
   
-  Construct_circumcenter_2
-    construct_circumcenter_2_object()
-  { return Construct_circumcenter_2(); }
-  
   Hyperbolic_Delaunay_triangulation_traits_2() 
   {}
   
@@ -199,9 +195,9 @@ public:
     side_of_oriented_circle_2_object() const
   { return Side_of_oriented_circle_2(); }
   
-  Construct_circumcenter_2
-    construct_circumcenter_2_object() const
-  { return Construct_circumcenter_2(); }
+  Construct_hyperbolic_circumcenter_2
+    construct_hyperbolic_circumcenter_2_object() const
+  { return Construct_hyperbolic_circumcenter_2(); }
   
   class Construct_hyperbolic_bisector_2
   {