Add comments to some ClientConfig fields

config.go

@@ -98,7 +98,9 @@ type ClientConfig struct {
 	MinDialTimeout             time.Duration
 	EstablishedConnsPerTorrent int
 	HalfOpenConnsPerTorrent    int
+	// Maximum number of peer addresses in reserve.
 	TorrentPeersHighWater int
+	// Minumum number of peers before effort is made to obtain more peers.
 	TorrentPeersLowWater int
 
 	// Limit how long handshake can take. This is to reduce the lingering
@@ -106,10 +108,14 @@ type ClientConfig struct {
 	// are obtained with 60s timeout, and 5% of unsuccessful handshakes.
 	HandshakesTimeout time.Duration
 
+	// The IP addresses as our peers should see them. May differ from the
+	// local interfaces due to NAT or other network configurations.
 	PublicIp4 net.IP
 	PublicIp6 net.IP
 
 	DisableAcceptRateLimiting bool
+	// Don't add connections that have the same peer ID as an existing
+	// connection for a given Torrent.
 	dropDuplicatePeerIds bool
 }