diff --git a/Apollonius_graph_2/doc/Apollonius_graph_2/CGAL/Apollonius_site_2.h b/Apollonius_graph_2/doc/Apollonius_graph_2/CGAL/Apollonius_site_2.h
index 02eb50f5829..603f759d3ca 100644
--- a/Apollonius_graph_2/doc/Apollonius_graph_2/CGAL/Apollonius_site_2.h
+++ b/Apollonius_graph_2/doc/Apollonius_graph_2/CGAL/Apollonius_site_2.h
@@ -53,6 +53,7 @@ Apollonius_site_2(Apollonius_site_2<K> other);
 /*! 
 Inserts the 
 Apollonius site `s` into the stream `os`. 
+\note Included through `CGAL/IO/Qt_widget_Apollonius_site_2.h`.
 \pre The insert operator must be defined for `Point_2` and `Weight`. 
 \relates Apollonius_site_2 
 */ 
@@ -62,6 +63,7 @@ const Apollonius_site_2<K>& s);
 /*! 
 Reads an Apollonius site from the stream `is` and assigns it 
 to `s`. 
+\note Included through `CGAL/IO/Qt_widget_Apollonius_site_2.h`.
 \pre The extract operator must be defined for `Point_2` and `Weight`. 
 \relates Apollonius_site_2 
 */ 
@@ -69,11 +71,8 @@ std::istream& operator>>(std::istream& is,
 const Apollonius_site_2<K>& s); 
 
 /*! 
-Inserts the Apollonius site `s` into the `Qt_widget` stream 
-`w`. 
-
-Included through \ref CGAL/IO/Qt_widget_Apollonius_site_2.h.
-
+Inserts the Apollonius site `s` into the `Qt_widget` stream `w`. 
+\note Included through `CGAL/IO/Qt_widget_Apollonius_site_2.h`.
 \pre The insert operator must be defined for `K::Circle_2`. 
 \relates Apollonius_site_2 
 */