diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..3c9cd6a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,42 @@
+# These don't have to be replaced unless you, for example, 
+# want to refer to a locally built version
+ARG STEAM_IMG=docker-steamcmd
+ARG STEAMCMD_TAG=latest
+
+FROM ${STEAM_IMG}:${STEAMCMD_TAG}
+
+# E.g. To install Counter Strike Source, run:
+# docker build --build-arg GAME_ID=232330 --rm -t game-cssource:latest .
+ARG GAME_ID
+
+# Preserve the ID specified for future reference
+ENV INSTALLED_GAME_ID=${GAME_ID}
+
+USER steam
+
+VOLUME [ ${DIR_GAME} ]
+
+# Installs the game specified in GAME_ID
+# Note: The game is installed in the DIR_GAME directory
+# prepared by docker-steamcmd.
+
+WORKDIR ${DIR_STEAMCMD}
+
+# TODO: Check if it's worth using proper steam login
+# not sure if Steam has rate limiting on anonymous accounts
+RUN ./steamcmd.sh \
+  +@NoPromptForPassword 1 \
+  +login anonymous \
+  +force_install_dir ${DIR_GAME} \
+  +app_update ${GAME_ID} validate \
+  +quit
+
+CMD [ "./steamcmd.sh" ]
+
+# CMD [ "./steamcmd.sh", \
+#   "+@NoPromptForPassword 1", \
+#   "+login anonymous", \
+#   "+force_install_dir ${DIR_GAME}", \
+#   "+app_update ${GAME_ID} validate", \
+#   "+quit" \
+#   ]
\ No newline at end of file
diff --git a/README.md b/README.md
index 8ae44b6..f2667d5 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
-# docker-steamcmd-install
-Barebones SteamCMD game installation using my docker-steamcmd image. 
+# SteamCMD with assumed game installation for Docker
+
+Uses my [docker-steamcmd](https://github.com/hellodeibu/docker-steamcmd) image. This barebones image is handy if you want to immediately install a specific game using SteamCMD. Simply provide the STEAM_APP_ID environment variable and that's it.
+
+Note: You probable want to use this image as a build stage for your game-specific image, so that you can do additional setup and configuration on top of a downloaded and ready to go game setup.