diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 2177a6f184..330a6df411 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1739,6 +1739,16 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-KERNEL_EXTRA_ARGS'><glossterm>KERNEL_EXTRA_ARGS</glossterm>
+            <glossdef>
+                <para>
+                    Specifies additional <filename>make</filename>
+                    command-line arguments the OpenEmbedded build system
+                    passes on when compiling the kernel.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-KERNEL_FEATURES'><glossterm>KERNEL_FEATURES</glossterm>
             <glossdef>
                 <para>Includes additional metadata from the Yocto Project kernel Git repository.