diff --git a/Alpha_shapes_2/doc_tex/Alpha_shapes_2_ref/Alpha_shape_2.tex b/Alpha_shapes_2/doc_tex/Alpha_shapes_2_ref/Alpha_shape_2.tex
index 2f777c847c1..a028325eda7 100644
--- a/Alpha_shapes_2/doc_tex/Alpha_shapes_2_ref/Alpha_shape_2.tex
+++ b/Alpha_shapes_2/doc_tex/Alpha_shapes_2_ref/Alpha_shape_2.tex
@@ -61,6 +61,8 @@ and the $k$-dimensional faces of the triangulation.
 Note that this class is at the same time used for {\em basic} and
 for {\em weighted} Alpha Shapes\ccIndexMainItem[C]{Weighted_alpha_shapes_2}.
 
+\ccInclude{CGAL/Alpha_shape_2.h}
+
 \ccInheritsFrom
 
 \ccc{Dt}