diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 3b7ae79eae..5784ba5914 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -2403,6 +2403,9 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 <para>The short (72 characters or less) summary of the binary package for packaging 
                     systems such as <filename>opkg</filename>, <filename>rpm</filename> or 
                     <filename>dpkg</filename>.
+                    By default, <filename>SUMMARY</filename> is used to define
+                    the <link linkend='var-DESCRIPTION'><filename>DESCRIPTION</filename></link>
+                    variable.
                 </para>
             </glossdef>
         </glossentry>