diff --git a/Nef_S2/include/CGAL/Nef_S2/SM_checker.h b/Nef_S2/include/CGAL/Nef_S2/SM_checker.h
index 444ddf537e2..148a4c22f91 100644
--- a/Nef_S2/include/CGAL/Nef_S2/SM_checker.h
+++ b/Nef_S2/include/CGAL/Nef_S2/SM_checker.h
@@ -246,10 +246,10 @@ check_is_triangulation() const
 }
 
 
-\subsection{Plane map input and output}
+/*\subsection{Plane map input and output}
 The input and output is mainly triggered by an IO Decorator which
 has the control over the IO format and does some basic parsing when
-reading input.
+reading input.*/
 
 } //namespace CGAL