diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 634c14fe9b..0f35abe2d9 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1637,6 +1637,29 @@
     </para>
 </section>
 
+<section id='ref-classes-qt4*'>
+    <title><filename>qt4*.bbclass</filename></title>
+
+    <para>
+        This family of classes consists of the following:
+        <itemizedlist>
+            <listitem><para><emphasis><filename>qt4e</filename>:</emphasis>
+                Supports building against Qt/Embedded, which uses the
+                framebuffer for graphical output.</para></listitem>
+            <listitem><para><emphasis><filename>qt4x11</filename>:</emphasis>
+                Supports building against Qt/X11.</para></listitem>
+        </itemizedlist>
+    </para>
+
+    <para>
+        These classes support recipes that need to build software that uses
+        the Qt development framework version 4.x.
+        The classes inherit the
+        <link linkend='ref-classes-qmake*'><filename>qmake2</filename></link>
+        class.
+    </para>
+</section>
+
 <section id='ref-classes-distutils'>
     <title>Python Extensions - <filename>distutils.bbclass</filename></title>