diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 824f6962ee..600da575fc 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3274,6 +3274,34 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
+ SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS
+
+
+ A list of recipe dependencies that should not be used to
+ determine signatures of tasks from one recipe when they
+ depend on tasks from another recipe.
+ For example:
+
+ SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += "intone->mplayer2"
+
+ In this example, intone depends on
+ mplayer2.
+
+
+
+ Use of this variable is one mechanism to remove dependencies
+ that affect task signatures and thus force rebuilds when a
+ recipe changes.
+
+ If you add an inappropriate dependency for a recipe
+ relationship, the build might break when the interface
+ of the second recipe changes after the first recipe has
+ been built.
+
+
+
+
+
SITEINFO_ENDIANNESS