diff --git a/Manuals/Tcpi-ug/Connectivity/Dialup/modem.docbook b/Manuals/Tcpi-ug/Connectivity/Dialup/modem.docbook
index 5f38cfa..5db80ca 100644
--- a/Manuals/Tcpi-ug/Connectivity/Dialup/modem.docbook
+++ b/Manuals/Tcpi-ug/Connectivity/Dialup/modem.docbook
@@ -5,8 +5,12 @@
     <para>
         In order to establish a PPP link between two computers using
         the telephone line as medium for data transmission, you need
-        to install and configure (at least) one Modem device in each
-        computer.
+        to install and configure one Modem device in each computer. On
+        the other hand, if you're planning to connect the same
+        computer to different networks simultaneously (e.g., to build
+        a proxy between them), you will need to install and configure
+        one Modem device for each different network you plan to
+        establish such simultaneous connection on.
     </para>
     
     <sect2 id="connectivity-dialup-modem-install">