diff --git a/README.md b/README.md
index 99e98d1..a365974 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ proxy-xray --<ltx|ltt|lttw|mtt|mttw|ttt|tttw|ssa|sst|stdin> [options]
     --mttw <VMESS-TCP-TLS-WS option>      uuid@host:port:/webpath
     --ttt  <TROJAN-TCP-TLS option>        password@host:port
     --tttw <TROJAN-TCP-TLS-WS option>     password@host:port:/webpath
+    -d|--debug                            Start in debug mode with DNS server disabled
     --stdin                               Read XRay config from stdin instead of auto generation
 
 $ docker run --name proxy-xray -p 21080:1080 -p 65353:53/udp -p 28123:8123 -d samuelhbne/proxy-xray --ltx bec24d96-410f-4723-8b3b-46987a1d9ed8@mydomain.duckdns.org:443