diff --git a/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_2.h b/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_2.h
index ca5f7c65f02..304ca8581a9 100644
--- a/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_2.h
+++ b/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_2.h
@@ -30,7 +30,7 @@ omitted.
 
 \pre first != beyond. 
 */
-template < typename InputIterator, typename K, typename Tag > 
+template < typename InputIterator, typename K, typename Tag, typename Diagonalize_traits > 
 typename K::FT 
 linear_least_squares_fitting_2(InputIterator first,
 InputIterator beyond,
diff --git a/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_3.h b/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_3.h
index c115a235d47..8b47c02334b 100644
--- a/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_3.h
+++ b/Principal_component_analysis/doc/Principal_component_analysis/CGAL/linear_least_squares_fitting_3.h
@@ -84,7 +84,7 @@ implementation `Internal_diagonalize_traits` is used.
 
 
 */
-template < typename InputIterator, typename K, typename Tag > 
+template < typename InputIterator, typename K, typename Tag, typename Diagonalize_traits > 
 typename K::FT 
 linear_least_squares_fitting_3(InputIterator first,
 InputIterator beyond,
@@ -126,7 +126,7 @@ implementation `Internal_diagonalize_traits` is used.
 </OL> 
 
 */
-template < typename InputIterator, typename K, typename Tag > 
+template < typename InputIterator, typename K, typename Tag, typename Diagonalize_traits > 
 typename K::FT 
 linear_least_squares_fitting_3(InputIterator first,
 InputIterator beyond,