diff --git a/Orthtree/doc/Orthtree/Concepts/OrthtreeTraits.h b/Orthtree/doc/Orthtree/Concepts/OrthtreeTraits.h
index 409d53bb7a1..c82941d1171 100644
--- a/Orthtree/doc/Orthtree/Concepts/OrthtreeTraits.h
+++ b/Orthtree/doc/Orthtree/Concepts/OrthtreeTraits.h
@@ -58,7 +58,7 @@ public:
    * It should take no arguments, and return an instance of `Node_data`.
    *
    * Typically, the `Node_data` of the root node contains all the elements in the tree.
-   * For a tree in which each node contains an `std::span` this function would return the span containing all items.
+   * For a tree in which each node contains an `std::span()` this function would return the span containing all items.
    *
    */
   using Construct_root_node_contents = unspecified_type;
@@ -67,7 +67,7 @@ public:
    * \brief Functor to locate in which halfspace a number of type `FT` is located with respect to another number of type `FT`.
    *
    * The functor is used by `Orthtree::locate()` to identify in which leaf node a point is located.
-   * Distribute_node_contents should use `Locate_halfspace` to guarantee consistency wich `Orthtree::locate()`.
+   * `Distribute_node_contents` mustt use `Locate_halfspace` to guarantee consistency wich `Orthtree::locate()`.
    */
   using Locate_halfspace = unspecified_type;
 
@@ -84,10 +84,10 @@ public:
   using Distribute_node_contents = unspecified_type;
 
   /*!
-   * \brief Functor with an operator to construct a `Point_d` from an appropriate number of x, y, z etc. `FT` arguments.
+   * \brief Functor with an operator to construct a `Point_d` from an appropriate number of x, y, z etc.\ `FT` arguments.
    *
-   * For trees which use a different kernel for the Bbox type,
-   * the return type of this functor must match the kernel used by the Bbox and not that of the contents.
+   * For trees which use a different kernel for the bounding box type,
+   * the return type of this functor must match the kernel used by the bounding box type and not that of the contents.
    */
   using Construct_point_d = unspecified_type;
 
diff --git a/Orthtree/doc/Orthtree/Concepts/OrthtreeTraversal.h b/Orthtree/doc/Orthtree/Concepts/OrthtreeTraversal.h
index 7572fa9c50b..175360bda6f 100644
--- a/Orthtree/doc/Orthtree/Concepts/OrthtreeTraversal.h
+++ b/Orthtree/doc/Orthtree/Concepts/OrthtreeTraversal.h
@@ -3,11 +3,11 @@
   \ingroup PkgOrthtreeConcepts
   \cgalConcept
 
-  \brief a traversal provides the functions needed to traverse the
+  \brief A traversal provides the functions needed to traverse the
   nodes of an orthtree.
 
   A traversal is used to iterate on a tree with a user-selected order
-  (e.g. preorder, postorder).
+  (e.g., preorder, postorder).
 
   \cgalHasModelsBegin
   \cgalHasModels{CGAL::Orthtrees::Preorder_traversal}
diff --git a/Orthtree/doc/Orthtree/PackageDescription.txt b/Orthtree/doc/Orthtree/PackageDescription.txt
index 27d72e488ff..cf761741d62 100644
--- a/Orthtree/doc/Orthtree/PackageDescription.txt
+++ b/Orthtree/doc/Orthtree/PackageDescription.txt
@@ -1,19 +1,16 @@
 /// \defgroup PkgOrthtreeRef Quadtrees, Octrees and Orthtrees Reference
 Quadtree, Octree and Orthtree Reference
 
-/// \defgroup PkgOrthtreeClasses Classes
+/// \defgroup PkgOrthtreeConcepts Concepts
 /// \ingroup PkgOrthtreeRef
 
 /// \defgroup PkgOrthtreeTraits Traits
-/// \ingroup PkgOrthtreeClasses
+/// \ingroup PkgOrthtreeRef
 
 /// \defgroup PkgOrthtreeSplitPredicates Split Predicates
-/// \ingroup PkgOrthtreeClasses
+/// \ingroup PkgOrthtreeRef
 
 /// \defgroup PkgOrthtreeTraversal Traversal
-/// \ingroup PkgOrthtreeClasses
-
-/// \defgroup PkgOrthtreeConcepts Concepts
 /// \ingroup PkgOrthtreeRef
 
 /// \defgroup PkgOrthtreeNeighbors Neighbor Search Functions
diff --git a/Orthtree/include/CGAL/Octree.h b/Orthtree/include/CGAL/Octree.h
index 1a7f6622141..1bdb02c7f2c 100644
--- a/Orthtree/include/CGAL/Octree.h
+++ b/Orthtree/include/CGAL/Octree.h
@@ -20,7 +20,7 @@
 namespace CGAL {
 
 /*!
-  \ingroup PkgOrthtreeClasses
+  \ingroup PkgOrthtreeRef
 
   \brief Alias that specializes the `Orthtree` class to a 3D octree.
 
diff --git a/Orthtree/include/CGAL/Orthtree.h b/Orthtree/include/CGAL/Orthtree.h
index 51c30f8ece1..563e6c94850 100644
--- a/Orthtree/include/CGAL/Orthtree.h
+++ b/Orthtree/include/CGAL/Orthtree.h
@@ -48,7 +48,7 @@
 namespace CGAL {
 
 /*!
-  \ingroup PkgOrthtreeClasses
+  \ingroup PkgOrthtreeRef
 
   \brief A data structure using an axis-aligned hyperrectangle
   decomposition of dD space for efficient access and
diff --git a/Orthtree/include/CGAL/Orthtree/Traversal_iterator.h b/Orthtree/include/CGAL/Orthtree/Traversal_iterator.h
index f202406fb1f..10152287538 100644
--- a/Orthtree/include/CGAL/Orthtree/Traversal_iterator.h
+++ b/Orthtree/include/CGAL/Orthtree/Traversal_iterator.h
@@ -25,7 +25,7 @@
 namespace CGAL {
 
 /*!
- * \ingroup PkgOrthtreeClasses
+ * \ingroup PkgOrthtreeTraversal
  *
  * \brief Wraps a traversal definition to produce an iterator which traverses the tree when incremented.
  *
diff --git a/Orthtree/include/CGAL/Quadtree.h b/Orthtree/include/CGAL/Quadtree.h
index 6b8d832bf8d..f9474a961df 100644
--- a/Orthtree/include/CGAL/Quadtree.h
+++ b/Orthtree/include/CGAL/Quadtree.h
@@ -20,7 +20,7 @@
 namespace CGAL {
 
 /*!
-  \ingroup PkgOrthtreeClasses
+  \ingroup PkgOrthtreeRef
 
   \brief Alias that specializes the `Orthtree` class to a 2D quadtree.