diff --git a/Dockerfile b/Dockerfile
index e4fa49c..2953be1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,7 +30,7 @@ COPY . /app/
 WORKDIR /app/
 
 ENV DOCKER_HOST unix:///tmp/docker.sock
-
+ENV NGINX_PROXY_CONTAINER true
 VOLUME ["/etc/nginx/certs", "/etc/nginx/dhparam"]
 
 ENTRYPOINT ["/app/docker-entrypoint.sh"]
diff --git a/README.md b/README.md
index 7a47ddb..7596c99 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ See [Automated Nginx Reverse Proxy for Docker][2] for why you might want to use
 
 To run it:
 
-    $ docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro -e NGINX_PROXY_CONTAINER=true jwilder/nginx-proxy
+    $ docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock:ro jwilder/nginx-proxy
 
 Then start any containers you want proxied with an env var `VIRTUAL_HOST=subdomain.youdomain.com`
 
@@ -48,8 +48,6 @@ services:
       - "80:80"
     volumes:
       - /var/run/docker.sock:/tmp/docker.sock:ro
-    environment:
-      - NGINX_PROXY_CONTAINER=true
 
   whoami:
     image: jwilder/whoami