diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 3be247a7dc..89bad481f4 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1309,6 +1309,25 @@
     </para>
 </section>
 
+<section id='ref-classes-packagedata'>
+    <title><filename>packagedata.bbclass</filename></title>
+
+    <para>
+        The package data (<filename>packagedata</filename>) class provides
+        common functionality for reading <filename>pkgdata</filename> files
+        found in
+        <link linkend='var-PKGDATA_DIR'><filename>PKGDATA_DIR</filename></link>.
+        These files contain information about each output package produced by
+        the OpenEmbedded build system.
+    </para>
+
+    <para>
+        This class is enabled by default because it is inherited by the
+        <link linkend='ref-classes-package'><filename>package</filename></link>
+        class.
+    </para>
+</section>
+
 <section id='ref-classes-perl'>
     <title>Perl Modules - <filename>cpan.bbclass</filename></title>