diff --git a/LDP/guide/docbook/Linux-Networking/Layering.xml b/LDP/guide/docbook/Linux-Networking/Layering.xml
index 707bf6e0..f4cc4963 100644
--- a/LDP/guide/docbook/Linux-Networking/Layering.xml
+++ b/LDP/guide/docbook/Linux-Networking/Layering.xml
@@ -120,19 +120,36 @@ to recognise implementation and design issues and pertaining to interfaces of la
 and their respective functions and services. 
 </para>
 
-- entity: in software, it is sometimes called a process; in hardware in hardware it 
-  could mean in pratice an I/O chip
-- peer enties: entities at the same layer in different machines/devices
-- service provider: eg. layer n, a layer that provides a service
-- service receiver: eg. layer n + 1, a layer that receives a service
-- service access point (SAP): a point where service is accessed, for example a 
-  function call in software, or the telephone for a telephone company
-- protocol data unit (PDU): a data unit that is communicated between peer entities
-- service data unit (SDU): the PDU from the serice receiver
-- protocol control information (PCI): is appended by a service receiver to an SDU 
-  in order to indicated the type of service required and forms the IDU
-- interface data unit (IDU): the data unit that is given from a service receiver to 
-  a service provider.
+
+<para><variablelist>
+
+<varlistentry><term>entity:</term>
+<listitem><para>in software, it is sometimes called a process; in hardware in hardware it could mean in pratice an I/O chip</para></listitem></varlistentry>
+
+<varlistentry><term>peer enties:</term>
+<listitem><para>entities at the same layer in different machines/devices</para></listitem></varlistentry>
+<varlistentry><term>service provider:</term> 
+<listitem><para>eg. layer n, a layer that provides a service</para></listitem></varlistentry>
+
+<varlistentry><term>service receiver:</term>
+<listitem><para>eg. layer n + 1, a layer that receives a service</para></listitem></varlistentry>
+
+<varlistentry><term>service access point (SAP):</term>
+<listitem><para>a point where service is accessed, for example a function call in software, or the telephone for a telephone company</para></listitem></varlistentry>
+
+<varlistentry><term>protocol data unit (PDU):</term>
+<listitem><para>a data unit that is communicated between peer entities</para></listitem></varlistentry>
+
+<varlistentry><term>service data unit (SDU):</term>
+<listitem><para>the PDU from the serice receiver</para></listitem></varlistentry>
+
+<varlistentry><term>protocol control information (PCI):</term>
+<listitem><para>is appended by a service receiver to an SDU in order to indicated the type of service required and forms the IDU</para></listitem></varlistentry>
+
+<varlistentry><term>interface data unit (IDU):</term>
+<listitem><para>the data unit that is given from a service receiver to a service provider.</para></listitem></varlistentry>
+
+</variablelist></para>
 
 <para>
 The term "service" can be deemed to mean a number of things. These are outlined
@@ -167,11 +184,24 @@ the service interface. The primitives differ for different services. As a simple
 example, a service may provide the following primitives:
 </para>
 
-1. LISTEN: listen for an incoming communication request
-2. CONNECT: make a communication request
-3. RECEIVE: receive data of a communication
-4. SEND: send data of a communication
-5. DISCONNECT: disconnect or discontinue a communication
+<para><orderedlist>
+
+<varlistentry><term>LISTEN:</term>
+<listitem><para>listen for an incoming communication request</para></listitem></varlistentry>
+
+<varlistentry><term>CONNECT:</term>
+<listitem><para>make a communication request</para></listitem></varlistentry>
+
+<varlistentry><term>RECEIVE:</term>
+<listitem><para>receive data of a communication</para></listitem></varlistentry>
+
+<varlistentry><term>SEND:</term>
+<listitem><para>send data of a communication</para></listitem></varlistentry>
+
+<varlistentry><term>DISCONNECT:</term>
+<listitem><para>disconnect or discontinue a communication</para></listitem></varlistentry>
+
+</orderedlist></para>
 
 <para>
 As discussed before, each layer has specfic functions and offers certain services