diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 44032e6409..2bbee9b300 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1431,7 +1431,16 @@
 
         <glossentry id='var-D'><glossterm>D</glossterm>
             <glossdef>
-                <para>The destination directory.</para>
+                <para>
+                    The destination directory. 
+                    The location in the <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
+                    , where components are installed by the do_install() task.
+                    This  defaults to:
+                    <literallayout class='monospaced'>
+                        ${WORKDIR}/image
+                    </literallayout>
+
+                </para>
             </glossdef>
         </glossentry>