net: Add documentation for VRF device

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index 310da42..d4d9d4f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11243,6 +11243,7 @@
 S:	Maintained
 F:	drivers/net/vrf.c
 F:	include/net/vrf.h
+F:	Documentation/networking/vrf.txt
 
 VT1211 HARDWARE MONITOR DRIVER
 M:	Juerg Haefliger <juergh@gmail.com>