[RFC 2/3] ref-manual: Update SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS

[Joshua Watt <jpewhacker@gmail.com>]

Describes the new wildcard syntax in the documentation

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
---
 documentation/ref-manual/ref-variables.xml | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 137a556d929..c5db057174b 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -12635,6 +12635,24 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     <filename>mplayer2</filename>.
                 </para>
 
+                <para>
+                    The special token <filename>"*"</filename> may be used on
+                    the left hand side of the dependency, which has the special
+                    meaning "all other recipes, except the one on the right hand
+                    side.
+                    For example:
+                    <literallayout class='monospaced'>
+    SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += "*->quilt-native"
+                    </literallayout>
+                </para>
+
+                <para>
+                    In this example, all recipes except
+                    <filename>quilt-native</filename> will ignore task
+                    signatures from the <filename>quilt-native</filename> recipe
+                    when determining their task signatures.
+                </para>
+
                 <para>
                     Use of this variable is one mechanism to remove dependencies
                     that affect task signatures and thus force rebuilds when a
-- 
2.14.3