diff --git a/Alpha_shapes_3/doc_tex/Alpha_shapes_3/PkgDescription.tex b/Alpha_shapes_3/doc_tex/Alpha_shapes_3/PkgDescription.tex
index 86d5f209817..e50052dd05e 100644
--- a/Alpha_shapes_3/doc_tex/Alpha_shapes_3/PkgDescription.tex
+++ b/Alpha_shapes_3/doc_tex/Alpha_shapes_3/PkgDescription.tex
@@ -1,8 +1,10 @@
 
 \begin{ccPkgDescription}{3D Alpha Shapes\label{Pkg:AlphaShapes3}}
-\ccPkgSummary{Alpha shapes are.  
-This package additionally offers weighted Alpha shapers
-based on the regular triangulation. }
+\ccPkgSummary{This package offers  a data structure encoding the whole family of alpha-complexes
+related to a given 3D Delaunay or regular triangulation. In particular, the data structure
+allows to retrieve   the alpha-complex for any alpha value, the whole spectrum of critical
+alpha values and a filtration on the triangulation faces (this filtration is based on the first 
+alpha value for which each face is included on the alpha-complex).}
 
 \ccPkgDependsOn{\ccRef[2D Triangulation]{Pkg:Triangulation3}}
 \ccPkgMaturity{Introduced in \cgal\ 2.4}