diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 887c0d0ee8..c8c6a669c9 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -1726,6 +1726,30 @@
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-TMPDIR'><glossterm>TMPDIR</glossterm>
+            <glossdef>
+                <para>
+                    This variable is the temporary directory the Yocto Project build system 
+                    uses when it does its work building images. 
+                    By default, the <filename>TMPDIR</filename> variable is named 
+                    <filename>tmp</filename> within the 
+                    <ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#yocto-project-build-directory'>
+                    Yocto Project Build Directory</ulink>.
+                </para>
+
+                <para>
+                    If you want to establish this directory in a location other than the
+                    default, you can uncomment the following statement in the 
+                    <filename>conf/local.conf</filename> file in the 
+                    <ulink url='http://www.yoctoproject.org/docs/latest/dev-manual/dev-manual.html#yocto-project-files'>
+                    Yocto Project Files</ulink>:
+                    <literallayout class='monospaced'>
+     #TMPDIR = "${TOPDIR}/tmp"
+                    </literallayout> 
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-TOPDIR'><glossterm>TOPDIR</glossterm>
             <glossdef>
                 <para>