diff --git a/Alpha_shapes_2/doc_tex/Alpha_shapes_2/PkgDescription.tex b/Alpha_shapes_2/doc_tex/Alpha_shapes_2/PkgDescription.tex
index a4f50dbbdcf..8151b7a45e4 100644
--- a/Alpha_shapes_2/doc_tex/Alpha_shapes_2/PkgDescription.tex
+++ b/Alpha_shapes_2/doc_tex/Alpha_shapes_2/PkgDescription.tex
@@ -1,5 +1,6 @@
 
 \begin{ccPkgDescription}{2D Alpha Shapes\label{Pkg:AlphaShape2}}
+\ccHowToCite{cgal:d-as2-06}
 \ccPkgSummary{
 This package offers  a data structure encoding the whole family of alpha-complexes
 related to a given 2D Delaunay or regular triangulation. In particular, the data structure