diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 21197806c2..6b42e4d821 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -1172,7 +1172,7 @@ recipes-graphics/xorg-font/encodings_1.0.4.bb:PR = "${INC_PR}.5"
      KERNEL_FEATURES="features/netfilter"
 
      # Add sound support to the qemux86 machine
-     KERNEL_FEATURES_append_qemux86="cfg/sound"
+     KERNEL_FEATURES_append_qemux86=" cfg/sound"
                     </literallayout></para>
             </glossdef>
         </glossentry>