diff --git a/Triangulation_3/doc_tex/TriangulationDS_3_ref/intro.tex b/Triangulation_3/doc_tex/TriangulationDS_3_ref/intro.tex
index cc276d84477..2e866d9d52a 100644
--- a/Triangulation_3/doc_tex/TriangulationDS_3_ref/intro.tex
+++ b/Triangulation_3/doc_tex/TriangulationDS_3_ref/intro.tex
@@ -36,7 +36,7 @@ dimension~1, each cell represents one edge $(0,1)$. (See
 Section~\ref{TDS3-sec-intro}.) 
 
 
-\section{Reference Pages}
+\section{Classified Reference Pages}
 
 \subsection*{Concepts}
 
diff --git a/Triangulation_3/doc_tex/Triangulation_3_ref/intro.tex b/Triangulation_3/doc_tex/Triangulation_3_ref/intro.tex
index aba21f8c66b..a57c473431d 100644
--- a/Triangulation_3/doc_tex/Triangulation_3_ref/intro.tex
+++ b/Triangulation_3/doc_tex/Triangulation_3_ref/intro.tex
@@ -50,7 +50,7 @@ is opposite to the vertex with the same index. See
 Figure~\ref{Triangulation3-fig-orient}.
 
 
-\section{Reference Pages}
+\section{Classified Reference Pages}
 
 \subsection*{Concepts}