diff --git a/docs/pdf/abstract.tex b/docs/pdf/abstract.tex
index ee6ed415..1589cb4a 100644
--- a/docs/pdf/abstract.tex
+++ b/docs/pdf/abstract.tex
@@ -17,6 +17,9 @@ employing object-oriented techniques, using Fortran 95 and MPI, with interfaces
 additional external libraries such as UMFPACK, SuperLU and SuperLU\_Dist, that
 can be exploited in building multi-level preconditioners.
 
+The software is freely  distributable,  under the terms of the license
+in Appendix~\ref{sec:distribution}. 
+
 This guide provides a brief description of the functionalities and
 the user interface of MLD2P4.
 \end{abstract}