diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 9470a780aa..6b2097ef34 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -7580,15 +7580,9 @@
                         However, providing just the <filename>.dtb</filename>
                         file is preferred.
                     </note>
-                    In order to use this variable, you must have the include
-                    files in your kernel recipe:
-                    <literallayout class='monospaced'>
-     require recipes-kernel/linux/linux-dtb.inc
-                    </literallayout>
-                    or
-                    <literallayout class='monospaced'>
-     require recipes-kernel/linux/linux-yocto.inc
-                    </literallayout>
+                    In order to use this variable, the
+                    <link linkend='ref-classes-kernel-devicetree'><filename>kernel-devicetree</filename></link>
+                    class must be inherited.
                 </para>
             </glossdef>
         </glossentry>