diff --git a/README.md b/README.md
index d2332ea..fc52836 100644
--- a/README.md
+++ b/README.md
@@ -123,12 +123,13 @@ Available Schemas:
   socks5: socks5 proxy
   http: http proxy
   redir: redirect proxy. (used on linux as a transparent proxy with iptables redirect rules)
-  tcptun: a simple tcp tunnel
-  udptun: a simple udp tunnel
+  tcptun: tcp tunnel
+  udptun: udp tunnel
+  uottun: udp over tcp tunnel
   dnstun: listen on udp port and forward all dns requests to remote dns server via forwarders(tcp)
 
 Available schemas for different modes:
-  listen: mixed ss socks5 http redir tcptun udptun dnstun
+  listen: mixed ss socks5 http redir tcptun udptun uottun dnstun
   forward: ss socks5 http
 
 Available methods for ss:
diff --git a/conf.go b/conf.go
index 0d1d680..ba231a0 100644
--- a/conf.go
+++ b/conf.go
@@ -140,13 +140,14 @@ func usage() {
 	fmt.Fprintf(os.Stderr, "  socks5: socks5 proxy\n")
 	fmt.Fprintf(os.Stderr, "  http: http proxy\n")
 	fmt.Fprintf(os.Stderr, "  redir: redirect proxy. (used on linux as a transparent proxy with iptables redirect rules)\n")
-	fmt.Fprintf(os.Stderr, "  tcptun: a simple tcp tunnel\n")
-	fmt.Fprintf(os.Stderr, "  udptun: a simple udp tunnel\n")
+	fmt.Fprintf(os.Stderr, "  tcptun: tcp tunnel\n")
+	fmt.Fprintf(os.Stderr, "  udptun: udp tunnel\n")
+	fmt.Fprintf(os.Stderr, "  uottun: udp over tcp tunnel\n")
 	fmt.Fprintf(os.Stderr, "  dnstun: listen on udp port and forward all dns requests to remote dns server via forwarders(tcp)\n")
 	fmt.Fprintf(os.Stderr, "\n")
 
 	fmt.Fprintf(os.Stderr, "Available schemas for different modes:\n")
-	fmt.Fprintf(os.Stderr, "  listen: mixed ss socks5 http redir tcptun udptun dnstun\n")
+	fmt.Fprintf(os.Stderr, "  listen: mixed ss socks5 http redir tcptun udptun uottun dnstun\n")
 	fmt.Fprintf(os.Stderr, "  forward: ss socks5 http\n")
 	fmt.Fprintf(os.Stderr, "\n")