diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 73d7692b36..320108e873 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1336,6 +1336,12 @@
         gives a BitBake user interface the ability to retrieve information
         about output packages from the <filename>pkgdata</filename> files.
     </para>
+
+    <para>
+        This class is enabled automatically when using the
+        <ulink url='&YOCTO_HOME_URL;/tools-resources/projects/hob'>Hob</ulink>
+        user interface.
+    </para>
 </section>
 
 <section id='ref-classes-perl'>