diff --git a/Dockerfile b/Dockerfile
index 1d59f7e..7702a52 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,5 +21,9 @@ RUN /apps/squid/sbin/squid -N -f /apps/squid.conf.cache -z
 RUN chown -R nobody:nogroup /apps/
 RUN chgrp -R 0 /apps && chmod -R g=u /apps
 
+ENV PATH=/apps/squid/sbin:${PATH}
+ENV CONF=/apps/squid.conf.forward
+
 EXPOSE 3128
-#CMD ["/usr/bin/supervisord"]
+
+CMD squid -NsY -f "${CONF}"
diff --git a/README.md b/README.md
index 890c54b..782581a 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,17 @@ To run the image, simply invoke a shell in the container and start squid in the
 are interested in:
 
 
+```bash
+# detached background run
+docker run -d -p 3128:3128 docker.io/salrashid123/squidproxy
+
+# alternative configuration file
+docker run -it -p 3128:3128 -e CONF=squid.conf.intercept docker.io/salrashid123/squidproxy
 ```
-docker run  -p 3128:3128 -ti docker.io/salrashid123/squidproxy /bin/bash
+
+```bash
+# interactive
+docker run -it -p 3128:3128 docker.io/salrashid123/squidproxy /bin/bash
 ```
 
 Also see