diff --git a/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h b/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
index 91a9fa8387d..0c9c730a29c 100644
--- a/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
+++ b/Kernel_23/doc/Kernel_23/Concepts/FunctionObjectConcepts.h
@@ -2808,6 +2808,52 @@ public:
 
 }; /* end Kernel::ComputeVolume_3 */
 
+
+
+/*!
+  \ingroup PkgKernel23ConceptsFunctionObjects
+  \cgalConcept
+
+  \cgalRefines `AdaptableFunctor` 
+
+*/
+class ComputeWeight_2 {
+public:
+
+  /// \name Operations
+  /// A model of this concept must provide:
+  /// @{
+
+  /*!
+    returns the weight of the weighted point.
+  */
+  Kernel::FT operator()(const Kernel::WeightedPoint_2& p) const; 
+
+}; /* end Kernel::ComputeWeight_2
+
+/*!
+  \ingroup PkgKernel23ConceptsFunctionObjects
+  \cgalConcept
+
+  \cgalRefines `AdaptableFunctor` 
+
+*/
+class ComputeWeight_3 {
+public:
+
+  /// \name Operations
+  /// A model of this concept must provide:
+  /// @{
+
+  /*!
+    returns the weight of the weighted point.
+  */
+  Kernel::FT operator()(const Kernel::WeightedPoint_3& p) const; 
+
+}; /* end Kernel::ComputeWeight_3
+
+
+
 /*!
   \ingroup PkgKernel23ConceptsFunctionObjects
   \cgalConcept
diff --git a/Kernel_23/doc/Kernel_23/Concepts/Kernel.h b/Kernel_23/doc/Kernel_23/Concepts/Kernel.h
index 093a3fb285f..e4281211604 100644
--- a/Kernel_23/doc/Kernel_23/Concepts/Kernel.h
+++ b/Kernel_23/doc/Kernel_23/Concepts/Kernel.h
@@ -422,6 +422,11 @@ public:
   */ 
   typedef unspecified_type Assign_2; 
 
+  /*!
+    a model of `Kernel::ComputeWeight_2`
+  */
+  typedef unspecified_type Compute_weight_2;
+
   /*!
     a model of `Kernel::ComputeX_2`
   */
@@ -1123,6 +1128,11 @@ public:
   */ 
   typedef unspecified_type Assign_3; 
 
+  /*!
+    a model of `Kernel::ComputeWeight_3`
+  */
+  typedef unspecified_type Compute_weight_3;
+
   /*!
     a model of `Kernel::ComputeX_3`
   */
diff --git a/Kernel_23/doc/Kernel_23/PackageDescription.txt b/Kernel_23/doc/Kernel_23/PackageDescription.txt
index 5891a4bc069..895b6f67416 100644
--- a/Kernel_23/doc/Kernel_23/PackageDescription.txt
+++ b/Kernel_23/doc/Kernel_23/PackageDescription.txt
@@ -316,6 +316,8 @@
 - `Kernel::ComputeSquaredRadius_2`
 - `Kernel::ComputeSquaredRadius_3`
 - `Kernel::ComputeVolume_3`
+- `Kernel::ComputeWeight_2`
+- `Kernel::ComputeWeight_3`
 - `Kernel::ComputeX_2`
 - `Kernel::ComputeX_3`
 - `Kernel::ComputeY_2`