diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 2cc962eead..3da993f53a 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -965,6 +965,15 @@
     </para>
 </section>
 
+<section id='ref-classes-image_types_uboot'>
+    <title><filename>image_types_uboot.bbclass</filename></title>
+
+    <para>
+        The U-Boot image types (<filename>image_types_uboot</filename>) class
+        defines additional image types specifically for the U-Boot bootloader.
+    </para>
+</section>
+
 <section id='ref-classes-mime'>
     <title><filename>mime.bbclass</filename></title>