diff --git a/README.md b/README.md
index f169cb6..47bd462 100644
--- a/README.md
+++ b/README.md
@@ -5,28 +5,43 @@ Card import tool for [Final Fantasy TCG Complete](https://steamcommunity.com/sha
 
 ## Usage
 
-    usage: main.py [-h] [-n COUNT] [OpusID]
+```
+usage: fftcgtool [-h] {opus,deck} ...
 
-    Imports FFTCG cards for TT-Sim.
+Imports FFTCG cards for TT-Sim.
 
-    positional arguments:
-      OpusID                the Opus to import
+optional arguments:
+  -h, --help   show this help message and exit
 
-    optional arguments:
-      -h, --help            show this help message and exit
-      -n COUNT, --num_threads COUNT
-                            maximum number of concurrent requests
+subcommands:
+  Import either an Opus to extend the mod, or import a deck to play right away.
+
+  {opus,deck}  valid subcommands
+```
 
 ### Run using your system's `python3`
 
-1. Make sure `PIL` and `requests` python3 libraries (or equivalent) are installed.
-1. Run `./main.py` from project root directory.
+1. Make sure you have at least python version `3.9` installed. 
+   To test, run `python --version` or similar. 
+   Also, `pipenv` should be installed for that python version.
+   Refer to [pipenv installation guide](https://pipenv.pypa.io/en/latest/install/) if needed.
+2. To install `fftcgtool` dependencies, run `pipenv install --deploy` from project root directory.
+3. Run `pipenv run ./main.py` from project root directory.
+4. You can `alias fftcgtool='PIPENV_PIPFILE="'$(pwd)'/Pipfile" pipenv run "'$(pwd)'/main.py"'` from
+   project root directory to define `fftcgtool` shorthand for your running shell.
 
 ### Run using a `docker` container
 
+> Caveat: This simplistic container runs `fftcgtool` as root user.
+> All generated files will thus be owned by `root:root` by default.
+
 1. Make sure you have a working installation of `docker` software.
-1. Update your local image `docker pull ldericher/fftcgtool`.
-1. Run `docker run --rm -it -v "$(pwd)/out:/app/out" ldericher/fftcgtool` in any directory.
+2. Update your local image .
+   - Either use `docker pull ldericher/fftcgtool`
+   - Or run `docker build --pull --tag ldericher/fftcgtool .`
+3. Run `docker run --rm -it -v "$(pwd)/out:/app/out" ldericher/fftcgtool` in any directory.
+4. You can `alias fftcgtool='docker run --rm -it -v "$(pwd)/out:/app/out" ldericher/fftcgtool'`
+   to define `fftcgtool` shorthand for your running shell.
 
 Output files will go to subdirectory `./out`. CLI arguments are supported as `docker run --rm -it -v "$(pwd)/out:/app/out" ldericher/fftcgtool -n 2 5` (imports Opus 5 using 2 threads)