diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index e2c0933473..19a53e0417 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3054,6 +3054,12 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     kernel compilation:
                     <literallayout class='monospaced'>
      INITRAMFS_IMAGE_BUNDLE = "1"
+                    </literallayout>
+                    By default, the
+                    <link linkend='ref-classes-kernel'><filename>kernel</filename></link>
+                    class sets this variable to a null string as follows:
+                    <literallayout class='monospaced'>
+     INITRAMFS_IMAGE_BUNDLE = ""
                     </literallayout>
                     <note>
                         You must set the