diff --git a/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/to_interval.tex b/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/to_interval.tex
index 3cddea71256..ee1475a548a 100644
--- a/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/to_interval.tex
+++ b/Algebraic_foundations/doc_tex/Algebraic_foundations_ref/to_interval.tex
@@ -4,13 +4,14 @@
 
 The template function \ccRefName\ computes for a given real embeddable 
 number $x$ a double interval containing $x$. 
-This interval is represented by a \ccc{CGAL::Interval_nt}. 
+This interval is represented by a \ccc{std::pair<double,double>}. 
 The function is guaranteed to be well defined in case the argument type 
 is a model of the \ccc{RealEmbeddable} concept. 
 
 \ccInclude{CGAL/number_utils.h}
 
-\ccFunction{template <class NT> Interval_nt to_interval(const NT& x);}
+\ccFunction{template <class NT> 
+std::pair<double,double> to_interval(const NT& x);}
 {}
 
 \ccSeeAlso