diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index cf77068e73..b2941b8bf9 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -3037,6 +3037,11 @@
                 The <filename>rootfs_ipk</filename> class, which supports
                 creation of root filesystems for images built using
                 <filename>.ipk</filename> packages.</para></listitem>
+            <listitem><para>
+                The <filename>rootfsdebugfiles</filename> class, which installs
+                additional files found on the build host directly into the
+                root filesystem.
+                </para></listitem>
         </itemizedlist>
     </para>