diff --git a/Interval_skip_list/doc_tex/Interval_skip_list_ref/intro.tex b/Interval_skip_list/doc_tex/Interval_skip_list_ref/intro.tex
index 1fc8bdcef1b..e59fd14c8f0 100644
--- a/Interval_skip_list/doc_tex/Interval_skip_list_ref/intro.tex
+++ b/Interval_skip_list/doc_tex/Interval_skip_list_ref/intro.tex
@@ -72,6 +72,10 @@ static, that is all intervals must be known in advance.
 This package has one concept, namely for the interval with which 
 the interval skip list class is parameterized.
 
+
+
+\section{Classified Reference Pages}
+
 \subsection*{Concepts}
 
 \ccRefConceptPage{Interval}\\
@@ -83,4 +87,3 @@ the interval skip list class is parameterized.
 \ccRefIdfierPage{CGAL::Interval_skip_list_interval<Value>}\\
 \ccRefIdfierPage{CGAL::Level_interval<FaceHandle>}\\
 
-\lcHtml{\ccHeading{Alphabetical List of Reference Pages}}
\ No newline at end of file