diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index c9b29d1035..9f13176d66 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -12674,6 +12674,36 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-SDKEXTPATH'><glossterm>SDKEXTPATH</glossterm>
+            <info>
+                SDKEXTPATH[doc] = "The default installation directory for the extensible SDK."
+            </info>
+            <glossdef>
+                <para role="glossdeffirst">
+<!--                <para role="glossdeffirst"><imagedata fileref="figures/define-generic.png" /> -->
+                    The default installation directory for the Extensible SDK.
+                    By default, this directory is based on the
+                    <link linkend='var-DISTRO'><filename>DISTRO</filename></link>
+                    variable and is set in the
+                    <link linkend='ref-classes-populate-sdk-*'><filename>populate_sdk_base</filename></link>
+                    class as follows:
+                    <literallayout class='monospaced'>
+     SDKEXTPATH ??= "~/${@d.getVar('DISTRO')}_sdk"
+                    </literallayout>
+                    For the default distribution "poky", the
+                    <filename>SDKEXTPATH</filename> is set to "poky_sdk".
+                </para>
+
+                <para>
+                    For information on how to change this default directory,
+                    see the
+                    "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-changing-the-default-sdk-installation-directory'>Changing the Default SDK Installation Directory</ulink>"
+                    section in the Yocto Project Application Development and
+                    the Extensible Software Development Kit (eSDK) manual.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-SDKIMAGE_FEATURES'><glossterm>SDKIMAGE_FEATURES</glossterm>
             <info>
                 SDKIMAGE_FEATURES[doc] = "Equivalent to IMAGE_FEATURES. However, this variable applies to the SDK generated from an image using the command 'bitbake -c populate_sdk imagename'."