diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 2bddc4eaae..acaae8cd9c 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1030,6 +1030,18 @@
     </para>
 </section>
 
+<section id='ref-classes-linux-kernel-base'>
+    <title><filename>linux-kernel-base.bbclass</filename></title>
+
+    <para>
+        The Linux kernel base (<filename>linux-kernel-base</filename>) class
+        provides common functionality for recipes that build out of the Linux
+        kernel source tree.
+        These builds goes beyond the kernel itself.
+        For example, the Perf recipe also inherits this class.
+    </para>
+</section>
+
 <section id='ref-classes-mime'>
     <title><filename>mime.bbclass</filename></title>