diff --git a/README.md b/README.md
index da0eb9b..7d23e97 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,8 @@ write_files:
 
 runcmd:
   - update-ca-certificates
+  - iptables -I INPUT 6 -m state --state NEW -p tcp --dport {PORT:-8000} -j ACCEPT
+  - netfilter-persistent save
   - pip install git+https://git.pictuga.com/pictuga/morss.git#egg=morss[full]
   - gunicorn --bind 0.0.0.0:${PORT:-8000} ${GUNICORN} --preload --access-logfile - morss
 ```