diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index ec747bf5f9..07715bea4e 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -109,8 +109,8 @@
                     To build a different variant of the recipe with a minimal amount of code, it usually
                     is as simple as adding the following to your recipe:
                     <literallayout class='monospaced'>
-     BBCLASSEXTEND = "native nativesdk"
-     BBCLASSEXTEND = "multilib:&lt;multilib_name&gt;"
+     BBCLASSEXTEND =+ "native nativesdk"
+     BBCLASSEXTEND =+ "multilib:&lt;multilib_name&gt;"
                     </literallayout>
                 </para>
              </glossdef>