diff --git a/documentation/ref-manual/introduction.xml b/documentation/ref-manual/introduction.xml
index a812760c11..1c4248c8f9 100644
--- a/documentation/ref-manual/introduction.xml
+++ b/documentation/ref-manual/introduction.xml
@@ -227,7 +227,7 @@
 <!--                <listitem><para>Debian GNU/Linux 6.0 (Squeeze)</para></listitem>
                 <listitem><para>Debian GNU/Linux 7.x (Wheezy)</para></listitem> -->
                 <listitem><para>Debian GNU/Linux 8.x (Jessie)</para></listitem>
-                <listitem><para>Dibian GNU/Linux 9.x (Stretch)</para></listitem>
+                <listitem><para>Debian GNU/Linux 9.x (Stretch)</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>