`--ip nnn.nnn.nnn.nnn`, or `-i nnn.nnn.nnn.nnn`: the IP address to use as the
target. Default is `0.0.0.0`.
-`--keepdomaincomments`, or `-k`: `false` (default) or `true`, keep the comments
-that appear on the same line as domains. The default is `false` since some
-router-based implementations can't handle comments in-line with hosts.
+`--keepdomaincomments`, or `-k`: `true` (default) or `false`, keep the comments
+that appear on the same line as domains. The default is `true`.
`--noupdate`, or `-n`: skip fetching updates from hosts data sources.