diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index e9bc81fe7b..02b949dc99 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -1467,10 +1467,26 @@
         <glossentry id='var-S'><glossterm>S</glossterm>
             <glossdef>
                 <para>
-                    The path to unpacked sources.
-                    By default, this path is as follows:
+                    The location in the <ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#yocto-project-build-directory'>
+                    Yocto Project Build Directory</ulink> where unpacked package source code resides.
+                    This location is within the working directory 
+                    (<filename><link linkend='var-WORKDIR'>WORKDIR</link></filename>), which 
+                    is not static.
+                    The unpacked source location depends on the package name 
+                    (<filename><link linkend='var-PN'>PN</link></filename>) and 
+                    package version (<filename><link linkend='var-PV'>PV</link></filename>) as 
+                    follows:
                     <literallayout class='monospaced'>
-     ${<link linkend='var-WORKDIR'>WORKDIR</link>}/${<link linkend='var-PN'>PN</link>}-${<link linkend='var-PV'>PV</link>}
+ ${WORKDIR}/${PN}-${PV}
+                    </literallayout>
+                    As an example, assume a 
+                    <ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#yocto-project-files'>
+                    Yocto Project Files</ulink> top-level directory named <filename>poky</filename> 
+                    and a default Yocto Project Build Directory of <filename>poky/build</filename>.
+                    In this case, the working directory the build system uses to build 
+                    the <filename>db</filename> package is the following:
+                    <literallayout class='monospaced'>
+ ~/poky/build/tmp/work/qemux86-poky-linux/db-5.1.19-r3/db-5.1.19
                     </literallayout>
                 </para>
             </glossdef>