diff --git a/docs/source/deployment.rst b/docs/source/deployment.rst
index 9971ad3..4e9fc1c 100644
--- a/docs/source/deployment.rst
+++ b/docs/source/deployment.rst
@@ -12,9 +12,10 @@ Assuming existing ``api.py`` and ``Pipfile.lock`` containing ``responder``.
 
     FROM kennethreitz/pipenv
     ENV PORT '80'
-
+`
     COPY . /app
     CMD python3 api.py
+    EXPOSE 80
 
 That's it!