diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index e3e6675100..979e7344b0 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -925,6 +925,21 @@
     </para>
 </section>
 
+<section id='ref-classes-image-swab'>
+    <title><filename>image-swab.bbclass</filename></title>
+
+    <para>
+        The image Swabber (<filename>image-swab</filename>) class
+        enables the
+        <ulink url='&YOCTO_HOME_URL;/tools-resources/projects/swabber'>Swabber</ulink>
+        tool in order to detect and log accesses to the host system during
+        the OpenEmbedded build process.
+        <note>
+            This class is currently unmaintained.
+        </note>
+    </para>
+</section>
+
 <section id='ref-classes-mime'>
     <title><filename>mime.bbclass</filename></title>