diff --git a/reference/gmagick/gmagick/levelimage.xml b/reference/gmagick/gmagick/levelimage.xml
index c204463081..e4a6680993 100644
--- a/reference/gmagick/gmagick/levelimage.xml
+++ b/reference/gmagick/gmagick/levelimage.xml
@@ -63,7 +63,8 @@
       <para>
        Provide any channel constant that is valid for your channel mode. 
 To apply to more than one channel, combine channeltype constants using bitwise
- operators. Defaults to Gmagick::CHANNEL_ALL. Refer to this list of channel constants. 
+ operators. Defaults to Gmagick::CHANNEL_ALL. Refer to this list of <link
+ linkend="gmagick.constants.channel">channel constants</link>.
       </para>
      </listitem>
     </varlistentry>