diff --git a/Dockerfile b/Dockerfile
index 513bba7..83b6f61 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,10 +2,12 @@ FROM debian:latest
 
 RUN apt-get update && apt-get install -y git bsdmainutils dnsutils ldnsutils host
 
-RUN git clone https://github.com/drwetter/testssl.sh.git /testssl.sh/
+RUN git clone --depth=1 https://github.com/drwetter/testssl.sh.git /testssl.sh/
 
 RUN ln -s /testssl.sh/testssl.sh /usr/local/bin/
 
 WORKDIR /testssl.sh/
 
 ENTRYPOINT ["testssl.sh","--openssl","/testssl.sh/bin/openssl.Linux.x86_64"]
+
+CMD ["--help"]
diff --git a/Dockerfile.md b/Dockerfile.md
new file mode 100644
index 0000000..1d16458
--- /dev/null
+++ b/Dockerfile.md
@@ -0,0 +1,9 @@
+## Usage:
+```
+docker run -t testssl.sh example.com
+```
+
+Ability to pull image from docker hub:
+```
+docker run -t dr4y/testssl.sh example.com
+```