diff --git a/Manuals/Tcpi-ug/Preface.docbook b/Manuals/Tcpi-ug/Preface.docbook
index e554e36..a7bfd2f 100755
--- a/Manuals/Tcpi-ug/Preface.docbook
+++ b/Manuals/Tcpi-ug/Preface.docbook
@@ -10,9 +10,22 @@
         This book describes how you can use the telephone network to
         share the development of &TCAR; with me, in a political system
         where the telephone line is the only communication network
-        most people have (still limitted) access to. To make the
-        information of this book managable, it has been organized in
-        the following parts:
+        most people have (still limitted) access to. This book
+        provides a guide you and your friends can follow to build your
+        own collaborative networks using computers and the telephone
+        network of your country.
+    </para>
+
+    <para>
+        To implement the configurations described in this book, you
+        need computers, modem devices, switches (optional), a
+        telephone network and need for sharing information with your
+        friends.
+    </para>
+    
+    <para>
+        To make the information of this book managable, it has been
+        organized in the following parts:
     </para>
 
     <itemizedlist>