diff --git a/Polygon_mesh_processing/include/CGAL/Rigid_triangle_mesh_collision_detection.h b/Polygon_mesh_processing/include/CGAL/Rigid_triangle_mesh_collision_detection.h
index 7b28b5d4121..312d56d54eb 100644
--- a/Polygon_mesh_processing/include/CGAL/Rigid_triangle_mesh_collision_detection.h
+++ b/Polygon_mesh_processing/include/CGAL/Rigid_triangle_mesh_collision_detection.h
@@ -37,7 +37,7 @@
 namespace CGAL {
 
 /*!
- * \ingroup PkgPolygonMeshProcessing
+ * \ingroup PkgPolygonMeshProcessingRef
  * This class provides methods to perform some intersection tests between triangle meshes
  * that undergo affine transformations (rotation, translation, and scaling).
  * Meshes are added to an internal set and are referenced using an id assigned when added to the set.