diff --git a/documentation/fonts.sgml b/documentation/fonts.sgml
index 6f0297dc20a926a7bd516c7bf087177344198faf..e45cbf450500cd7917e45cdfe13b6d0b5face5b2 100644
--- a/documentation/fonts.sgml
+++ b/documentation/fonts.sgml
@@ -43,7 +43,7 @@
             <para>
               Convert <filename>.bdf</filename> files produced by Step
               1 into <filename>.pcf</filename> files with
-              <command>bdftopcf</command>.
+              <command>bdftopcf -o &lt;target file&gt; &lt;original bdf-file&gt;</command>.
             </para>
           </listitem>
           <listitem>