diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 9cb742fc7b..0ec878edab 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -719,6 +719,17 @@
     </para>
 </section>
 
+<section id='ref-classes-gtk-doc'>
+    <title><filename>gtk-doc.bbclass</filename></title>
+
+    <para>
+        The GIMP Toolkit Documentation (<filename>gtk-doc</filename>) class
+        is a helper class to pull in the appropriate
+        <filename>gtk-doc</filename> dependencies and disable
+        <filename>gtk-doc</filename>.
+    </para>
+</section>
+
 <section id='ref-classes-gtk-icon-cache'>
     <title><filename>gtk-icon-cache.bbclass</filename></title>