diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 00c5f26887..1cd82d25e2 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -5526,6 +5526,24 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-PACKAGE_PREPROCESS_FUNCS'><glossterm>PACKAGE_PREPROCESS_FUNCS</glossterm>
+            <glossdef>
+                <para>
+                    Specifies a list of functions run to perform additional
+                    splitting of files into individual packages.
+                    Recipes can either prepend to this variable or prepend
+                    to the <filename>populate_packages</filename> function
+                    in order to perform the additional package splitting.
+                    In either case, the function should set
+                    <link linkend='var-PACKAGES'><filename>PACKAGES</filename></link>,
+                    <link linkend='var-FILES'><filename>FILES</filename></link>,
+                    <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>
+                    and other packaging variables appropriately in order to
+                    perform the desired splitting.
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-PACKAGECONFIG'><glossterm>PACKAGECONFIG</glossterm>
             <glossdef>
                 <para>