diff --git a/documentation/ref-manual/introduction.xml b/documentation/ref-manual/introduction.xml
index 17cdb5f0a1..9c6193cd44 100644
--- a/documentation/ref-manual/introduction.xml
+++ b/documentation/ref-manual/introduction.xml
@@ -20,9 +20,9 @@
         For task-based information using the Yocto Project, see the
         <ulink url='&YOCTO_DOCS_DEV_URL;'>Yocto Project Development Manual</ulink>
         and the <ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;'>Yocto Project Linux Kernel Development Manual</ulink>.
-        For Board Support Package (BSP) structure information, see the 
+        For Board Support Package (BSP) structure information, see the
         <ulink url='&YOCTO_DOCS_BSP_URL;'>Yocto Project Board Support Package (BSP) Developer's Guide</ulink>.
-        You can also find lots of Yocto Project information on the 
+        You can also find lots of Yocto Project information on the
         <ulink url="&YOCTO_HOME_URL;">Yocto Project website</ulink>.
     </para>
 </section>
@@ -33,7 +33,7 @@
         This reference manual consists of the following:
         <itemizedlist>
             <listitem><para><emphasis>
-                <link linkend='usingpoky'>Using the Yocto Project</link>:</emphasis> 
+                <link linkend='usingpoky'>Using the Yocto Project</link>:</emphasis>
                 Provides an overview of the components that make up the Yocto Project
                 followed by information about debugging images created in the Yocto Project.
                 </para></listitem>
@@ -103,21 +103,16 @@
         <para>
             Currently, the Yocto Project is supported on the following distributions:
             <itemizedlist>
+                <listitem><para>Ubuntu 13.04</para></listitem>
                 <listitem><para>Ubuntu 10.04</para></listitem>
                 <listitem><para>Ubuntu 11.10</para></listitem>
                 <listitem><para>Ubuntu 12.10</para></listitem>
-                <listitem><para>Fedora release 16 (Verne)</para></listitem>
                 <listitem><para>Fedora release 17 (Beefy Miracle)</para></listitem>
                 <listitem><para>Fedora release 18 (Spherical Cow)</para></listitem>
-                <listitem><para>CentOS release 5.6 (Final)</para></listitem>
-                <listitem><para>CentOS release 5.7 (Final)</para></listitem>
-                <listitem><para>CentOS release 5.8 (Final)</para></listitem>
                 <listitem><para>CentOS release 6.3 (Final)</para></listitem>
                 <listitem><para>CentOS release 6.4 (Final)</para></listitem>
                 <listitem><para>Debian GNU/Linux 6.0 (squeeze)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.0</para></listitem>
-                <listitem><para>openSUSE 11.4</para></listitem>
-                <listitem><para>openSUSE 12.1</para></listitem>
                 <listitem><para>openSUSE 12.2</para></listitem>
                 <listitem><para>openSUSE 12.3</para></listitem>
             </itemizedlist>