diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index c7a814860ce10ec5e413dc996917b845787ca0d0..b2cf91e4ccaa11fd140af7ece0c7b11b820e048c 100644
--- a/net/ipv4/Kconfig
+++ b/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.