diff --git a/direct.go b/direct.go
index b0084dd..576d06a 100644
--- a/direct.go
+++ b/direct.go
@@ -29,7 +29,7 @@ func (d *direct) Dial(network, addr string) (net.Conn, error) {
 	return c, err
 }
 
-// DialUDP connects to the given address via the proxy.
+// DialUDP connects to the given address via the proxy
 func (d *direct) DialUDP(network, addr string) (net.PacketConn, net.Addr, error) {
 	pc, err := net.ListenPacket(network, "")
 	if err != nil {
diff --git a/ipset_linux.go b/ipset_linux.go
index edb94f4..eddb5e0 100644
--- a/ipset_linux.go
+++ b/ipset_linux.go
@@ -18,16 +18,17 @@ import (
 
 // netfilter netlink message types
 // https://github.com/torvalds/linux/blob/9e66317d3c92ddaab330c125dfe9d06eee268aff/include/uapi/linux/netfilter/nfnetlink.h#L56
+// NFNL_SUBSYS_IPSET
 const NFNL_SUBSYS_IPSET = 6
 
 // http://git.netfilter.org/ipset/tree/include/libipset/linux_ip_set.h
-/* The protocol version */
+// IPSET_PROTOCOL: The protocol version
 const IPSET_PROTOCOL = 6
 
-/* The max length of strings including NUL: set and type identifiers */
+// IPSET_MAXNAMELEN: The max length of strings including NUL: set and type identifiers
 const IPSET_MAXNAMELEN = 32
 
-/* Message types and commands */
+// Message types and commands
 const IPSET_CMD_CREATE = 2
 const IPSET_CMD_FLUSH = 4
 const IPSET_CMD_ADD = 9
diff --git a/rule.go b/rule.go
index 5e04d8a..2a11419 100644
--- a/rule.go
+++ b/rule.go
@@ -113,6 +113,7 @@ func (rd *RuleDialer) Dial(network, addr string) (net.Conn, error) {
 	return rd.NextDialer(addr).Dial(network, addr)
 }
 
+// DialUDP connects to the given address via the proxy
 func (rd *RuleDialer) DialUDP(network, addr string) (pc net.PacketConn, writeTo net.Addr, err error) {
 	return rd.NextDialer(addr).DialUDP(network, addr)
 }
diff --git a/socks5.go b/socks5.go
index ac7154c..32b0184 100644
--- a/socks5.go
+++ b/socks5.go
@@ -563,6 +563,7 @@ func NewSocks5PktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr Addr, tgtHea
 	return pc
 }
 
+// ReadFrom overrides the original function from net.PacketConn
 func (pc *Socks5PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	if !pc.tgtHeader {
 		return pc.PacketConn.ReadFrom(b)
@@ -595,6 +596,7 @@ func (pc *Socks5PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	return n - len(tgtAddr), raddr, err
 }
 
+// WriteTo overrides the original function from net.PacketConn
 func (pc *Socks5PktConn) WriteTo(b []byte, addr net.Addr) (int, error) {
 	if !pc.tgtHeader {
 		return pc.PacketConn.WriteTo(b, addr)
diff --git a/ss.go b/ss.go
index a63952e..d7adbab 100644
--- a/ss.go
+++ b/ss.go
@@ -87,14 +87,14 @@ func (s *SS) ServeTCP(c net.Conn) {
 
 		rc, err := net.ListenPacket("udp", "")
 		if err != nil {
-			logf("UDP remote listen error: %v", err)
+			logf("proxy-ss UDP remote listen error: %v", err)
 		}
 		defer rc.Close()
 
 		req := make([]byte, udpBufSize)
 		n, err := c.Read(req)
 		if err != nil {
-			logf("error in ioutil.ReadAll: %s\n", err)
+			logf("proxy-ss error in ioutil.ReadAll: %s\n", err)
 			return
 		}
 
@@ -263,6 +263,7 @@ func NewPktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr Addr, tgtHeader bo
 	return pc
 }
 
+// ReadFrom overrides the original function from net.PacketConn
 func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	if !pc.tgtHeader {
 		return pc.PacketConn.ReadFrom(b)
@@ -289,6 +290,7 @@ func (pc *PktConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	return n - len(tgtAddr), raddr, err
 }
 
+// WriteTo overrides the original function from net.PacketConn
 func (pc *PktConn) WriteTo(b []byte, addr net.Addr) (int, error) {
 	if !pc.tgtHeader {
 		return pc.PacketConn.WriteTo(b, addr)