diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index fac6d9046b..131babf4bf 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3652,7 +3652,12 @@
             <glossdef>
                 <para role="glossdeffirst">
 <!--                <para role="glossdeffirst"><imagedata fileref="figures/define-generic.png" /> -->
-                    The list of additional features to include in an image.
+                    A list of additional features to include in an image.
+                    When listing more than one feature, separate them with
+                    a space.
+                </para>
+
+                <para>
                     Typically, you configure this variable in your
                     <filename>local.conf</filename> file, which is found in the
                     <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.