diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 541a173cee..0c197535b4 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -352,6 +352,21 @@
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-CORE_IMAGE_EXTRA_INSTALL'><glossterm>CORE_IMAGE_EXTRA_INSTALL</glossterm>
+            <glossdef>
+                <para>
+                    Specifies the list of packages to be added to the image. 
+                    This variable should only be set in the <filename>local.conf</filename>
+                    configuration file found in the 
+                    <ulink url='&YOCTO_DOCS_DEV_URL;#yocto-project-build-directory'>Yocto Project Build Directory</ulink>.
+                </para>
+
+                <para>
+                    This variable replaces <filename>POKY_EXTRA_INSTALL</filename>, which is no longer supported.
+                </para>
+            </glossdef>
+        </glossentry>
+
     </glossdiv>
 
     <glossdiv id='var-glossary-d'><title>D</title>