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diff --git a/doc/tex/preface.tex b/doc/tex/preface.tex
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+++ b/doc/tex/preface.tex
@@ -1,11 +1,13 @@
 \chapter{Preface}
 
-This document tries to demonstrate the \gnutls{} library API, the
-protocols and the technology involved. I believe that a basic
-understanding of the underlying protocols is important, before
-using \tls{}. This is because security and cryptographic
-protocols are involved, which require the application programmer
-to make correct use of these protocols, or no security is
-offered. Although this document tries to be self contained, basic 
+This document tries to demonstrate and explain the \gnutls{} library API.
+A brief introduction to the protocols and the technology involved, is
+also included. This is also important for a \tls{} application programmer
+to know, because security and cryptographic protocols are involved. 
+Those require the programmer
+to make correct use of these protocols, or risks to offer a false feeling
+of security, on an unsecured application.
+
+Although this document tries to be self contained, basic 
 network programming and PKI knowlegde is assumed in most of this document. 
-I suggest \cite{GUTPKI} for an introduction to Public Key Infrastructure.
+\cite{GUTPKI} is a good introduction to Public Key Infrastructure.