diff --git a/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_regular_triangulation_3.h b/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_regular_triangulation_3.h
index 31cc5a71d3d..5e8938db6c0 100644
--- a/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_regular_triangulation_3.h
+++ b/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_regular_triangulation_3.h
@@ -17,7 +17,7 @@ Its default value is:
 CGAL::Triangulation_data_structure_3<
   CGAL::Regular_triangulation_vertex_base_3<PT,Periodic_3_triangulation_ds_vertex_base_3<> >,
   CGAL::Regular_triangulation_cell_base_3<PT,Periodic_3_triangulation_ds_cell_base_3<> > >
-\endcond
+\endcode
 
 \sa `CGAL::Periodic_3_triangulation_3<PT, TDS>`
 \sa `CGAL::Periodic_3_Delaunay_triangulation_3<PT, TDS>`
diff --git a/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_triangulation_3.h b/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_triangulation_3.h
index 66ddfe72eca..10569a5784c 100644
--- a/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_triangulation_3.h
+++ b/Periodic_3_triangulation_3/doc/Periodic_3_triangulation_3/CGAL/Periodic_3_triangulation_3.h
@@ -16,7 +16,7 @@ Its default value is:
 CGAL::Triangulation_data_structure_3<
   CGAL::Triangulation_vertex_base_3<PT,Periodic_3_triangulation_ds_vertex_base_3<> >,
   CGAL::Triangulation_cell_base_3<PT,Periodic_3_triangulation_ds_cell_base_3<> > >
-\endcond
+\endcode
 
 \sa `CGAL::Periodic_3_Delaunay_triangulation_3<Traits, TDS>`
 \sa `CGAL::Periodic_3_regular_triangulation_3<Traits, TDS>`