diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 3eccc2ab81..8cf036dbd0 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -12209,13 +12209,26 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     A list of classes to remove from the
                     <link linkend='var-INHERIT'><filename>INHERIT</filename></link>
                     value globally within the extensible SDK configuration.
-                    The default value is "buildhistory icecc".
+                    The
+                    <link linkend='ref-classes-populate-sdk-*'><filename>populate-sdk-ext</filename></link>
+                    class sets the default value:
+                    <literallayout class='monospaced'>
+     SDK_INHERIT_BLACKLIST ?= "buildhistory icecc"
+                    </literallayout>
                 </para>
 
                 <para>
                     Some classes are not generally applicable within
-                    the extensible SDK context and you can use this variable
-                    to disable them.
+                    the extensible SDK context.
+                    You can use this variable to disable those classes.
+                </para>
+
+                <para>
+                    For additional information on how to extend the
+                    customize the extensible SDK's configuration, see the
+                    "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-configuring-the-extensible-sdk'>Configuring the Extensible SDK</ulink>"
+                    section in the Yocto Project Application Development and
+                    the Extensible Software Development Kit (eSDK) manual.
                 </para>
             </glossdef>
         </glossentry>