diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index eb9ef956f7..1be7dd5c9b 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1695,6 +1695,7 @@
         gtk-immodules-cache.bbclass
         gzipnative.bbclass
         icecc.bbclass
+        image-empty.bbclass
         image-live.bbclass
         image-vmdk.bbclass
         image-mklibs.bbclass