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 @@
+
+ gtk-doc.bbclass
+
+
+ The GIMP Toolkit Documentation (gtk-doc) class
+ is a helper class to pull in the appropriate
+ gtk-doc dependencies and disable
+ gtk-doc.
+
+
+