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diff --git a/net/nmap/DESCR b/net/nmap/DESCR
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@@ -1,6 +1,7 @@
-Nmap is a utility for port scanning large networks, although it works fine
-for single hosts. It supports many different scanning techniques and has
-a number of performance and reliability features such as dynamic delay time
-calculations, packet timeout and retransmission, parallel port scanning,
-detection of down hosts via parallel pings, and flexible target and port
-specification.
+Nmap ("Network Mapper") is a free open source utility for network exploration
+or security auditing. It was designed to rapidly scan large networks,
+although it works fine against single hosts. Nmap uses raw IP packets in
+novel ways to determine what hosts are available on the network, what services
+(application name and version) they are offering, what operating system (and
+OS version) they are running, what type of packet filters/firewalls are in
+use, and dozens of other characteristics.