diff --git a/introduction/welcome/conventions.xml b/introduction/welcome/conventions.xml
index 621a36f292..2418da15de 100644
--- a/introduction/welcome/conventions.xml
+++ b/introduction/welcome/conventions.xml
@@ -33,6 +33,12 @@
     show filenames such as <filename>/boot/grub/grub.conf</filename></para>
   </blockquote>
 
+  <note>
+    <para>Please configure your browser to display fixed-width text with
+    a good monospaced font, with which you can distinguish the glyphs of
+    <literal>Il1</literal> or <literal>O0</literal> clearly.</para>
+  </note>
+
   <para><emphasis>Emphasis</emphasis></para>
 
   <blockquote>