put setcap command in README

README.md

@@ -70,7 +70,12 @@ sudo sysctl -w net.ipv4.ping_group_range="0   2147483647"
 ```
 
 If you do not wish to do this, you can set `pinger.SetPrivileged(true)` and
-run as super-user.
+use setcap to allow your binary using go-ping to bind to raw sockets
+(or just run as super-user):
+
+```
+setcap cap_net_raw=+ep /bin/goping-binary
+```
 
 See [this blog](https://sturmflut.github.io/linux/ubuntu/2015/01/17/unprivileged-icmp-sockets-on-linux/)
 and [the Go icmp library](https://godoc.org/golang.org/x/net/icmp) for more details.