gethostlatency
diff --git a/tools/gethostlatency_example.txt b/tools/gethostlatency_example.txt
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+Demonstrations of gethostlatency, the Linux eBPF/bcc version.
+
+
+This traces host name lookup calls (getaddrinfo(), gethostbyname(), and
+gethostbyname2()), and shows the PID and command performing the lookup, the
+latency (duration) of the call in milliseconds, and the host string:
+
+# ./gethostlatency
+TIME PID COMM LATms HOST
+06:10:24 28011 wget 90.00 www.iovisor.org
+06:10:28 28127 wget 0.00 www.iovisor.org
+06:10:41 28404 wget 9.00 www.netflix.com
+06:10:48 28544 curl 35.00 www.netflix.com.au
+06:11:10 29054 curl 31.00 www.plumgrid.com
+06:11:16 29195 curl 3.00 www.facebook.com
+06:11:25 29404 curl 72.00 foo
+06:11:28 29475 curl 1.00 foo
+
+In this example, the first call to lookup "www.iovisor.org" took 90 ms, and
+the second took 0 ms (cached). The slowest call in this example was to "foo",
+which was an unsuccessful lookup.