diff --git a/README.md b/README.md
index 88292e2..dc50780 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,12 @@
+## Portforwardings on NATted IPv6 Networks and forwardings on IPv6 necessary:
+- 5349/tcp
+- 5349/udp
+- 49160-49200/udp
+
 # functional test:
 ```
 . /home/docker/turn.$(hostname)/env
 docker run -ti coturn/coturn timeout -k 70 60 turnutils_uclient -p 5349 -W $TURN_SECRET -v -y turn.$(hostname).
 ```
+
+