diff --git a/Triangulation_2/doc/Triangulation_2/Concepts/TriangulationTraits_2.h b/Triangulation_2/doc/Triangulation_2/Concepts/TriangulationTraits_2.h
index 086f5d7f189..2c9a2808ca8 100644
--- a/Triangulation_2/doc/Triangulation_2/Concepts/TriangulationTraits_2.h
+++ b/Triangulation_2/doc/Triangulation_2/Concepts/TriangulationTraits_2.h
@@ -3,6 +3,8 @@
 \ingroup PkgTriangulation2Concepts
 \cgalConcept
 
+\cgalRefines SpatialSortingTraits_2
+
 The concept `TriangulationTraits_2` describes the set of requirements
 to be fulfilled by any class used to instantiate the first template
 parameter of the class `CGAL::Triangulation_2<Traits,Tds>`.  This concept
diff --git a/Triangulation_3/doc/Triangulation_3/Concepts/TriangulationTraits_3.h b/Triangulation_3/doc/Triangulation_3/Concepts/TriangulationTraits_3.h
index f7dbb8d9b4f..ba26a15ab5c 100644
--- a/Triangulation_3/doc/Triangulation_3/Concepts/TriangulationTraits_3.h
+++ b/Triangulation_3/doc/Triangulation_3/Concepts/TriangulationTraits_3.h
@@ -3,6 +3,8 @@
 \ingroup PkgTriangulation3Concepts
 \cgalConcept
 
+\cgalRefines SpatialSortingTraits_3
+
 The concept `TriangulationTraits_3` is the first template parameter of the class 
 `Triangulation_3`. It defines the geometric objects (points, segments, 
 triangles and tetrahedra) forming the triangulation together with a few