diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 5da3863fc4..27d56313e8 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -2744,6 +2744,19 @@
     </para>
 </section>
 
+<section id='ref-classes-waf'>
+    <title><filename>waf.bbclass</filename></title>
+
+    <para>
+        The <filename>waf</filename> class supports recipes that need to build
+        software that uses the Waf build system.
+        You can use the
+        <link linkend='var-EXTRA_OECONF'><filename>EXTRA_OECONF</filename></link>
+        variable to specify additional configuration options to be passed on
+        the Waf command line.
+    </para>
+</section>
+
 <section id='ref-classes-externalsrc'>
     <title><filename>externalsrc.bbclass</filename></title>