diff --git a/README.md b/README.md
index d303449..72e3a2a 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,8 @@ node -r esm src/server
 # In another term run:
 node -r esm src/worker
 
+# Firewall, open port 8080
+
 ```
 
 # Upstream