diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index e377c26fb9..0ee36d09c0 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -9280,6 +9280,21 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-SDK_PREFIX'><glossterm><imagedata fileref="figures/define-generic.png" />SDK_PREFIX</glossterm>
+            <info>
+                SDK_PREFIX[doc] = "The toolchain binary prefix used for nativesdk recipes."
+            </info>
+            <glossdef>
+                <para>
+                    The toolchain binary prefix used for nativesdk recipes.
+                    The OpenEmbedded build system uses the
+                    <filename>SDK_PREFIX</filename> value to set the
+                    <link linkend='var-TARGET_PREFIX'><filename>TARGET_PREFIX</filename></link>
+                    when building <filename>nativesdk</filename> recipes.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-SDKIMAGE_FEATURES'><glossterm><imagedata fileref="figures/define-generic.png" />SDKIMAGE_FEATURES</glossterm>
             <info>
                 SDKIMAGE_FEATURES[doc] = "Equivalent to IMAGE_FEATURES. However, this variable applies to the SDK generated from an image using the command 'bitbake -c populate_sdk imagename'."