diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 66bb6a8138..5add80f815 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -4043,6 +4043,12 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     to provide the initial RAM disk image.
                     The default value is "core-image-minimal-initramfs".
                 </para>
+
+                <para>
+                    See the
+                    <link linkend='ref-classes-image-live'><filename>image-live</filename></link>
+                    class for more information.
+                </para>
             </glossdef>
         </glossentry>
 
@@ -4086,8 +4092,12 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     stops the script in levels 0, 1 and 6.
                 </para>
                 <para>
-                    The variable is mandatory and is used in recipes when using
-                    <filename>update-rc.d.bbclass</filename>.
+                    The variable's default value is "defaults", which is
+                    set in the
+                    <link linkend='ref-classes-update-rc.d'><filename>update-rc.d</filename></link>
+                    class.
+                </para>
+                <para>
                     The value in
                     <filename>INITSCRIPT_PARAMS</filename> is passed through
                     to the <filename>update-rc.d</filename> command.