diff --git a/documentation/poky-ref-manual/ref-classes.xml b/documentation/poky-ref-manual/ref-classes.xml
index c06e362cad..93cf2cc5e1 100644
--- a/documentation/poky-ref-manual/ref-classes.xml
+++ b/documentation/poky-ref-manual/ref-classes.xml
@@ -262,6 +262,28 @@
     </para>
 </section>
 
+<section id='ref-classes-packagegroup'>
+    <title>Package Groups - <filename>packagegroup.bbclass</filename></title>
+
+    <para>
+        This class sets default values appropriate for package group recipes (such as 
+        <filename><link linkend='var-PACKAGES'>PACKAGES</link></filename>, 
+        <filename><link linkend='var-PACKAGE_ARCH'>PACKAGE_ARCH</link></filename>, 
+        <filename><link linkend='var-ALLOW_EMPTY'>ALLOW_EMPTY</link></filename>, 
+        and so forth. 
+        It is highly recommended that all package group recipes inherit this class.
+    </para>
+    <para>
+        For information on how to use this class, see the 
+        "<ulink url='&YOCTO_DOCS_DEV_URL;#usingpoky-extend-customimage-customtasks'>Customizing Images Using Custom Package Tasks</ulink>" 
+        section in the Yocto Project Development Manual.
+    </para>
+    <para>
+        Previously, this class was named <filename>task.bbclass</filename>.
+    </para>
+</section>
+
+
 <section id='ref-classes-package'>
     <title>Packaging - <filename>package*.bbclass</filename></title>
 
@@ -659,7 +681,6 @@
         sstate.bbclass
         staging.bbclass
         syslinux.bbclass
-        task.bbclass
         terminal.bbclass
         tinderclient.bbclass
         toolchain-scripts.bbclass