Update README.md (#802)

README.md

@@ -6,7 +6,7 @@ ZMap: The Internet Scanner
 ZMap is a fast single packet network scanner designed for Internet-wide network
 surveys. On a typical desktop computer with a gigabit Ethernet connection, ZMap
 is capable scanning the entire public IPv4 address space on a single port in 
-under 45 minutes. With a 10gigE connection and [PF_RING](http://www.ntop.org/products/packet-capture/pf_ring/),
+under 45 minutes. With a 10gigE connection and [netmap](http://info.iet.unipi.it/~luigi/netmap/) or [PF_RING](http://www.ntop.org/products/packet-capture/pf_ring/),
 ZMap can scan the IPv4 address space in under 5 minutes.
 
 ZMap operates on GNU/Linux, Mac OS, and BSD. ZMap currently has fully implemented