diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 36a6c2b79889e7858dddccf66f79ff56369ca2da..14f0b336519f4a9bd52fa3d677bd428db2214e5c 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -136,6 +136,20 @@ config IPV6_TUNNEL
 
 	  If unsure, say N.
 
+config IPV6_SUBTREES
+	bool "IPv6: source address based routing"
+	depends on IPV6 && EXPERIMENTAL
+	---help---
+	  Enable routing by source address or prefix.
+
+	  The destination address is still the primary routing key, so mixing
+	  normal and source prefix specific routes in the same routing table
+	  may sometimes lead to unintended routing behavior.  This can be
+	  avoided by defining different routing tables for the normal and
+	  source prefix specific routes.
+
+	  If unsure, say N.
+
 config IPV6_MULTIPLE_TABLES
 	bool "IPv6: Multiple Routing Tables"
 	depends on IPV6 && EXPERIMENTAL