diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--AreMergeable_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--AreMergeable_2.h
index 498828600d8..6a94b58de0e 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--AreMergeable_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--AreMergeable_2.h
@@ -1,4 +1,4 @@
-
+namespace ArrDirectionalTraits {
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
 \cgalConcept
@@ -9,7 +9,7 @@
 
 */
 
-class ArrDirectionalTraits::AreMergeable_2 {
+class AreMergeable_2 {
 public:
 
 /// \name Has Models 
@@ -30,3 +30,4 @@ ArrDirectionalTraits::X_monotone_curve_2 xc2);
 
 }; /* end ArrDirectionalTraits::AreMergeable_2 */
 
+}
\ No newline at end of file
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--CompareEndpointsXy_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--CompareEndpointsXy_2.h
index 2635feda5aa..32af43558c5 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--CompareEndpointsXy_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--CompareEndpointsXy_2.h
@@ -1,3 +1,4 @@
+namespace ArrDirectionalTraits {
 
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
@@ -9,7 +10,7 @@
 
 */
 
-class ArrDirectionalTraits::CompareEndpointsXy_2 {
+class CompareEndpointsXy_2 {
 public:
 
 /// \name Has Models 
@@ -27,3 +28,4 @@ Comparison_result operator()(ArrDirectionalTraits::X_monotone_curve_2 xc);
 
 }; /* end ArrDirectionalTraits::CompareEndpointsXy_2 */
 
+}
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--ConstructOpposite_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--ConstructOpposite_2.h
index bf18d6651f3..00d9331782b 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--ConstructOpposite_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--ConstructOpposite_2.h
@@ -1,3 +1,4 @@
+namespace ArrDirectionalTraits {
 
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
@@ -9,7 +10,7 @@
 
 */
 
-class ArrDirectionalTraits::ConstructOpposite_2 {
+class ConstructOpposite_2 {
 public:
 
 /// \name Has Models 
@@ -26,3 +27,4 @@ ArrDirectionalTraits::X_monotone_curve_2 operator()(ArrDirectionalTraits::X_mono
 
 }; /* end ArrDirectionalTraits::ConstructOpposite_2 */
 
+}
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Intersect_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Intersect_2.h
index abeea00e3bd..798f320d509 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Intersect_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Intersect_2.h
@@ -1,4 +1,4 @@
-
+namespace ArrDirectionalTraits {
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
 \cgalConcept
@@ -9,7 +9,7 @@
 
 */
 
-class ArrDirectionalTraits::Intersect_2 {
+class Intersect_2 {
 public:
 
 /// \name Has Models 
@@ -38,3 +38,4 @@ Output_iterator& oi);
 
 }; /* end ArrDirectionalTraits::Intersect_2 */
 
+}
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Merge_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Merge_2.h
index eb92e48e25b..f334fb42ad8 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Merge_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Merge_2.h
@@ -1,4 +1,4 @@
-
+namespace ArrDirectionalTraits {
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
 \cgalConcept
@@ -9,7 +9,7 @@
 
 */
 
-class ArrDirectionalTraits::Merge_2 {
+class Merge_2 {
 public:
 
 /// \name Has Models 
@@ -34,3 +34,4 @@ ArrDirectionalTraits::X_monotone_curve_2& xc);
 
 }; /* end ArrDirectionalTraits::Merge_2 */
 
+}
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Split_2.h b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Split_2.h
index e9e48a78e8a..ef5ae2ac0f9 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Split_2.h
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/Concepts/ArrDirectionalTraits--Split_2.h
@@ -1,4 +1,4 @@
-
+namespace ArrDirectionalTraits {
 /*!
 \ingroup PkgBooleanSetOperations2Concepts
 \cgalConcept
@@ -9,7 +9,7 @@
 
 */
 
-class ArrDirectionalTraits::Split_2 {
+class Split_2 {
 public:
 
 /// \name Has Models 
@@ -33,3 +33,4 @@ ArrDirectionalTraits::X_monotone_curve_2& xc2);
 
 }; /* end ArrDirectionalTraits::Split_2 */
 
+}
\ No newline at end of file
diff --git a/Boolean_set_operations_2/doc/Boolean_set_operations_2/PackageDescription.txt b/Boolean_set_operations_2/doc/Boolean_set_operations_2/PackageDescription.txt
index 32687229314..73013a874d5 100644
--- a/Boolean_set_operations_2/doc/Boolean_set_operations_2/PackageDescription.txt
+++ b/Boolean_set_operations_2/doc/Boolean_set_operations_2/PackageDescription.txt
@@ -2,6 +2,10 @@
 /// \defgroup PkgBooleanSetOperations2Concepts Concepts
 /// \ingroup PkgBooleanSetOperations2
 
+/// \cgalConceptNamespace
+/// The namespace containing concepts specific to 2D Boolean Set Operations.
+namespace ArrDirectionalTraits {}
+
 /*!
 \addtogroup PkgBooleanSetOperations2
 \todo check generated documentation