diff --git a/AABB_tree/include/CGAL/AABB_traits.h b/AABB_tree/include/CGAL/AABB_traits.h
index ad6834edc52..18c455900b9 100644
--- a/AABB_tree/include/CGAL/AABB_traits.h
+++ b/AABB_tree/include/CGAL/AABB_traits.h
@@ -188,7 +188,10 @@ struct AABB_traits_base_2<GeomTraits,true>{
 /// \tparam Primitive provide the type of primitives stored in the AABB_tree.
 ///   It is a model of the concept `AABBPrimitive` or `AABBPrimitiveWithSharedData`.
 ///
-/// \tparam BboxMap must be a property map....................
+/// \tparam BboxMap must be a property map that has as key type a primitive id,
+///                 and as value type a `Bounding_box`.
+///                 If the type is `Default` the `Datum` must have the
+///                 member function `bbox()` that returns the bounding box  of the primitive.
 ///
 /// If the argument `GeomTraits` is a model of the concept \ref
 /// `AABBRayIntersectionGeomTraits`, this class is also a model of \ref