diff --git a/docker/Dockerfile b/docker/Dockerfile
index 36d6b2a8..26a8b7ee 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -17,7 +17,7 @@ ENV DEBIAN_FRONTEND="noninteractive" \
     SPHINX_BIN_TARGZ="sphinx-3.1.1-bin.tar.gz"
 
 ADD "https://bitbucket.org/jsuto/piler/downloads/${PACKAGE}" "/${PACKAGE}"
-ADD files/start.sh /start.sh 
+ADD start.sh /start.sh
 
 RUN apt-get update && \
     apt-get -y --no-install-recommends install \
diff --git a/docker/README b/docker/README
new file mode 100644
index 00000000..0065fe4d
--- /dev/null
+++ b/docker/README
@@ -0,0 +1,12 @@
+How to build
+
+  Pick the latest deb package from Bitbucket download page (https://bitbucket.org/jsuto/piler/downloads/)
+  and use it as the PACKAGE build argument, eg.
+
+  docker build --build-arg PACKAGE=piler_1.3.6~bionic-65cc7eb_amd64.deb -t sutoj/piler .
+
+How to run the image
+
+  Set the PILER_HOST env variable to match your hostname, eg.
+
+  docker run -d --name piler1 -p 25:25 -p 80:80 -e PILER_HOST=archive.yourdomain.com sutoj/piler