diff --git a/Segment_Delaunay_graph_2/doc/Segment_Delaunay_graph_2/Segment_Delaunay_graph_2.txt b/Segment_Delaunay_graph_2/doc/Segment_Delaunay_graph_2/Segment_Delaunay_graph_2.txt
index 5353a324fd5..725444580b2 100644
--- a/Segment_Delaunay_graph_2/doc/Segment_Delaunay_graph_2/Segment_Delaunay_graph_2.txt
+++ b/Segment_Delaunay_graph_2/doc/Segment_Delaunay_graph_2/Segment_Delaunay_graph_2.txt
@@ -400,7 +400,7 @@ classes:
 `Segment_Delaunay_graph_filtered_traits_2<CK,CM,EK,EM,FK,FM>` and
 `Segment_Delaunay_graph_filtered_traits_without_intersections_2<CK,CM,EK,EM,FK,FM>`.
 
-Arithmetic Filtering##
+\subsection Segment_Delaunay_graph_2ArithmeticFiltering Arithmetic Filtering
 
 As mentioned above, performing computations with exact arithmetic
 can be very costly. For this reason we have devoted considerable
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