Udpate README.md with EXPOSE instruction matching LISTEN_PORT

tiangolo · Dec 8, 2017 · 584b465 · 584b465
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diff --git a/README.md b/README.md
@@ -107,13 +107,17 @@ By default, the container made from this image will listen on port 80.
 
 To change this behavior, set the `LISTEN_PORT` environment variable.
 
+You might also need to create the respective `EXPOSE` Docker instruction.
+
 You can do that in your `Dockerfile`, it would look something like:
 
 ```Dockerfile
 FROM tiangolo/uwsgi-nginx:python3.6
 
 ENV LISTEN_PORT 8080
 
+EXPOSE 8080
+
 COPY ./app /app
 ```