kconfig: add a note about the deps to the 'silentoldconfig' help

Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/README b/README
index d6c6c74..7a078ff 100644
--- a/README
+++ b/README
@@ -174,6 +174,7 @@
 	"make silentoldconfig"
 			   Like above, but avoids cluttering the screen
 			   with questions already answered.
+			   Additionally updates the dependencies.
 	"make defconfig"   Create a ./.config file by using the default
 			   symbol values from arch/$ARCH/defconfig.
 	"make allyesconfig"