diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index c9fedb20bb..e64f88bf1f 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1913,6 +1913,15 @@
     </para>
 </section>
 
+<section id='ref-classes-sip'>
+    <title><filename>sip.bbclass</filename></title>
+
+    <para>
+        The <filename>sip</filename> class
+        supports recipes that build or package SIP-based Python bindings.
+    </para>
+</section>
+
 <section id='ref-classes-package_tar'>
     <title><filename>package_tar.bbclass</filename></title>