diff --git a/Dockerfile b/Dockerfile
index 5b94bcb..e3a5a58 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,21 +1,22 @@
 ARG REPO=library
 FROM ${REPO}/python:3-alpine
 
+# TODO: Copy from docker hub image
 ARG ARCH=x86_64
 COPY ./build/qemu-${ARCH}-static /usr/bin/
 
-
 RUN mkdir -p /src
 WORKDIR /src
 
-COPY ./requirements.txt ./
-RUN pip install -r ./requirements.txt
+# Get Cloudflare example script
+ENV CF_VERSION=2.6.0
+ADD https://raw.githubusercontent.com/cloudflare/python-cloudflare/$CF_VERSION/examples/example_update_dynamic_dns.py ./update_ddns.py
+RUN chmod +x ./update_ddns.py
 
-COPY ./start.sh ./
-COPY ./update_ddns.py ./update_ddns.py
+RUN pip install cloudflare==$CF_VERSION
 
 ENV DOMAIN=""
 
 USER nobody
 
-CMD [ "/src/start.sh" ]
+ENTRYPOINT [ "/src/update_ddns.py" ]
diff --git a/Makefile b/Makefile
index ec80dfe..a481c9c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 DOCKER_TAG ?= cloudflare-ddns-dev-${USER}
+.PHONY: clean all
 
 .PHONY: default
 default: test
@@ -7,11 +8,6 @@ default: test
 test:
 	@echo ok
 
-.PHONY: update
-update:
-	curl -o update_ddns.py https://raw.githubusercontent.com/cloudflare/python-cloudflare/master/examples/example_update_dynamic_dns.py
-	chmod +x update_ddns.py
-
 .PHONY: build
 build: build/qemu-x86_64-static
 	docker build . -t ${DOCKER_TAG}
@@ -35,7 +31,8 @@ cross-build-arm64: build/qemu-aarch64-static
 
 .PHONY: run
 run: build
-	docker run --rm -e DOMAIN=${DOMAIN} \
+	docker run --rm  \
 		-e CF_API_EMAIL=${CF_API_EMAIL} \
 		-e CF_API_KEY=${CF_API_KEY} \
-		${DOCKER_TAG}
+		${DOCKER_TAG} \
+		"${DOMAIN}"
diff --git a/README.md b/README.md
index 04591a1..7dca0ef 100644
--- a/README.md
+++ b/README.md
@@ -4,18 +4,25 @@ Simple Docker image to dynamically update a Cloudflare DNS record.
 
 ## Usage
 
-All parameters are passed to the script using env variables, so export the following:
+There are two things to configure. First, the domain that you wish to update needs to be provided as a command line argument. This can be done by adding it to the end of your run command (example in the Makefile) or by adding it as a command to your compose file. Eg:
 
-    DOMAIN=sub.example.com
-    CF_API_EMAIL=admin@example.com
+    ddns:
+      image: IamTheFij/cloudflare-ddns
+      command: ["example.com"]
+
+Your Cloudflare credentials can be passed in any way that [python-cloudflare](https://github.com/cloudflare/python-cloudflare) allows. Generally, either via envioronment variables:
+
+    CF_API_EMAIL=admin@example.com  # Do not set if using an API Token
     CF_API_KEY=00000000000000000000
+    CF_API_CERTKEY='v1.0-...'
+
+Or by providing a file mounted to the working directory in the image, `/src/.cloudflare.cfg` that contains something like:
+
+    [CloudFlare]
+    emal = admin@example.com  # Do not set if using an API Token
+    token = 00000000000000000000
+    certtoken = v1.0-...
 
 Then run. To execute from this directory, you can use the convenient Make target.
 
     make run
-
-## Development
-
-The script is straight from the examples provided by Cloudflare on their Github. The latest version can be downloaded using:
-
-    make update
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 0a9630a..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-cloudflare
diff --git a/start.sh b/start.sh
deleted file mode 100755
index 2993157..0000000
--- a/start.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#! /bin/sh
-
-exec /src/update_ddns.py $DOMAIN