diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index c490fc360d..fc95845c66 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1679,6 +1679,22 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-LINUX_VERSION'><glossterm>LINUX_VERSION</glossterm>
+            <glossdef>
+                <para>The Linux version from <filename>kernel.org</filename>
+                    on which the Linux kernel image being built using the
+                    OpenEmbedded build system is based.
+                    You define this varible in the kernel recipe.
+                    For example, the <filename>linux-yocto-3.4.bb</filename>
+                    kernel recipe found in
+                    <filename>meta/recipes-kernel/linux</filename>
+                    defines the variables as follows:
+                    <literallayout class='monospaced'>
+  LINUX_VERSION ?= "3.4.24"
+                    </literallayout></para>
+            </glossdef>
+        </glossentry>
+
     </glossdiv>
 
     <glossdiv id='var-glossary-m'><title>M</title>