diff --git a/documentation/ref-manual/introduction.xml b/documentation/ref-manual/introduction.xml
index f986f7c28e..ae6c50fbfa 100644
--- a/documentation/ref-manual/introduction.xml
+++ b/documentation/ref-manual/introduction.xml
@@ -160,16 +160,15 @@
                 <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</para></listitem>
-                <listitem><para>CentOS release 6.5</para></listitem>
+                <listitem><para>CentOS release 6.x</para></listitem>
 <!--                <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem> -->
-                <listitem><para>Debian GNU/Linux 7.0 (Wheezy)</para></listitem>
-                <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
+                <listitem><para>Debian GNU/Linux 7.x (Wheezy)</para></listitem>
+<!--                <listitem><para>Debian GNU/Linux 7.1 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.2 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.3 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.4 (Wheezy)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.5 (Wheezy)</para></listitem>
-                <listitem><para>Debian GNU/Linux 7.6 (Wheezy)</para></listitem>
+                <listitem><para>Debian GNU/Linux 7.6 (Wheezy)</para></listitem> -->
 <!--                <listitem><para>openSUSE 11.4</para></listitem>
                 <listitem><para>openSUSE 12.1</para></listitem> -->
                 <listitem><para>openSUSE 12.2</para></listitem>