diff --git a/[refs] b/[refs]
index d318933eaa6c..d7fc7ee39f69 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e18f5feb0c851a0e77e315b3d9ef1c432b1a50ec
+refs/heads/master: d18921a0e319ab512f8186b1b1142c7b8634c779
diff --git a/trunk/net/ipv4/Kconfig b/trunk/net/ipv4/Kconfig
index c7a814860ce1..b2cf91e4ccaa 100644
--- a/trunk/net/ipv4/Kconfig
+++ b/trunk/net/ipv4/Kconfig
@@ -50,6 +50,8 @@ config IP_ADVANCED_ROUTER
 	  echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
 
 	  Note that some distributions enable it in startup scripts.
+	  For details about rp_filter strict and loose mode read
+	  <file:Documentation/networking/ip-sysctl.txt>.
 
 	  If unsure, say N here.