diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 85e6d778fb..6843094fca 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -590,9 +590,11 @@
                     add metadata for all BSPs.</para>
                 <para>The metadata you add through this variable includes config fragments and 
                     features descriptions,
-                    which usually include patches as well as config fragments.
+                    which usually includes patches as well as config fragments.
                     You typically override the <filename>KERNEL_FEATURES</filename> variable
-                    for a specific machine.</para>
+                    for a specific machine.
+                    In this way, you can provide validated, but optional, sets of kernel
+                    configurations and features.</para>
                 <para>For example, the following adds <filename>netfilter</filename> to all 
                     the Linux Yocto kernels and adds sound support to the <filename>qemux86</filename>
                     machine: