diff --git a/reference/imagick/imagick/convolveimage.xml b/reference/imagick/imagick/convolveimage.xml
index b35a9de5af..22f9da1fcb 100644
--- a/reference/imagick/imagick/convolveimage.xml
+++ b/reference/imagick/imagick/convolveimage.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.imagick-convolveimage">
  <refnamediv>
   <refname>Imagick::convolveImage</refname>
@@ -28,6 +28,7 @@
      <term><parameter>kernel</parameter></term>
      <listitem>
       <para>
+      The convolution kernel
       </para>
      </listitem>
     </varlistentry>
@@ -35,6 +36,10 @@
      <term><parameter>channel</parameter></term>
      <listitem>
       <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 Imagick::CHANNEL_ALL. Refer to this
+       list of  <link linkend="imagick.constants.channel">channel constants</link>.
       </para>
      </listitem>
     </varlistentry>