diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 43f76e9211..824f6962ee 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3254,6 +3254,26 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
+        <glossentry id='var-SIGGEN_EXCLUDERECIPES_ABISAFE'><glossterm>SIGGEN_EXCLUDERECIPES_ABISAFE</glossterm>
+            <glossdef>
+                <para>
+                    A list of recipes that are completely stable and will 
+                    never change.
+                    The ABI for the recipes in the list are presented by
+                    output from the tasks run to build the recipe.
+                    Use of this variable is one way to remove dependencies from 
+                    one recipe on another that affect task signatures and
+                    thus force rebuilds when the recipe changes. 
+                    <caution>
+                        If you add an inappropriate variable to this list,
+                        other recipes might break when the interface of the 
+                        recipe changes after the other recipes have been
+                        built.
+                    </caution>
+                </para>
+            </glossdef>
+        </glossentry>
+
         <glossentry id='var-SITEINFO_ENDIANNESS'><glossterm>SITEINFO_ENDIANNESS</glossterm>
             <glossdef>
                 <para>