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diff --git a/doc/tex/preface.tex b/doc/tex/preface.tex
index a06f76d9b7..77730ea34b 100644
--- a/doc/tex/preface.tex
+++ b/doc/tex/preface.tex
@@ -3,14 +3,15 @@
 \section*{Introduction}
 This document tries to demonstrate and explain the \gnutls{} library API.
 A brief introduction to the protocols and the technology involved, is
-also included. That way a \tls{} application programmer can better understand
+also included so that an application programmer can better understand
 the \gnutls{} purpose and actual offerings. 
 Even if \gnutls{} is a typical library software, it operates over several
 security and cryptographic protocols, which require the programmer
-to make careful and correct usage of them. Otherwise he risks to offer
-just a false sense of security. Security is a very general term for computer
-software and cannot be restricted to a single cryptographic library.
-A program should not be considered secure just because it uses \gnutls{},
+to make careful and correct usage of them, otherwise he risks to offer
+just a false sense of security. Security and the network security terms
+are very general terms even for computer software thus cannot be easily
+restricted to a single cryptographic library.
+For that reason, do not consider a program secure just because it uses \gnutls{};
 there are several ways to compromise a program or a communication line
 and \gnutls{} only helps with some of them. 
 \par