diff --git a/CHANGES.rst b/CHANGES.rst
index 00ad5176..3eb3b2cb 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -17,7 +17,9 @@ Breaking changes:
 
 New features:
 
-- *add item here*
+- Document development setup
+  Ref: #358
+  [niccokunzmann]
 
 Bug fixes:
 
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 66e28eb9..37e0bc63 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -21,3 +21,11 @@ For pull requests, keep this in mind
 - Describe your change in CHANGES.rst
 
 - Add yourself to the docs/credits.rst
+
+Development Setup
+-----------------
+
+If you would like to setup icalendar to
+contribute changes, the `Installation Section
+<https://icalendar.readthedocs.io/en/latest/install.html>`_
+should help you further.
diff --git a/docs/credits.rst b/docs/credits.rst
index 420af8d4..3086e6e9 100644
--- a/docs/credits.rst
+++ b/docs/credits.rst
@@ -56,6 +56,7 @@ icalendar contributors
 - Clive Stevens <clivest2@gmail.com>
 - Dalton Durst <github@daltondur.st>
 - Kamil Mańkowski <kam193@wp.pl>
+- `Nicco Kunzmann <https://github.com/niccokunzmann>`_
 
 Find out who contributed::
 
diff --git a/docs/install.rst b/docs/install.rst
index 8556b05e..8c8b1c7a 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -10,6 +10,109 @@ package, like this::
 
   >>> import icalendar
 
+Development Setup
+-----------------
+
+To start contributing changes to icalendar,
+you can clone the project to your file system
+using Git.
+You can `fork <https://github.com/collective/icalendar/fork>`_
+the project first and clone your fork, too.
+
+.. code-block:: bash
+
+    git clone https://github.com/collective/icalendar.git
+    cd icalendar
+
+Installing Python
+-----------------
+
+You will need a version of Python installed to run the tests
+and execute the code.
+The latest version of Python 3 should work and will be enough
+to get you started.
+If you like to run the tests with different Python versions,
+the following setup proecess should work the same.
+
+Install Tox
+-----------
+
+First, install `tox <https://pypi.org/project/tox/>`_..
+
+.. code-block:: bash
+
+    pip install tox
+
+From now on, tox will manage Python versions and
+test commands for you.
+
+Running Tests
+-------------
+
+``tox`` manages all test environments in all Python versions.
+
+To run all tests in all environments, simply run ``tox``
+
+.. code-block:: bash
+
+    tox
+
+You may not have all Python versions installed or
+you may want to run a specific one.
+Have a look at the `documentation
+<https://tox.wiki/en/latest/example/general.html#selecting-one-or-more-environments-to-run-tests-against>`__.
+This is how you can run ``tox`` with Python 3.9:
+
+.. code-block:: bash
+
+    tox -e py39
+
+Accessing a ``tox`` environment
+-------------------------------
+
+If you like to enter a specific tox environment,
+you can do this:
+
+.. code-block:: bash
+
+    source .tox/py39/bin/activate
+
+Install ``icalendar``  Manually
+-------------------------------
+
+The best way to test the package is to use ``tox`` as
+described above.
+If for some reason you cannot install ``tox``, you can
+go ahead with the following section using your
+installed version of Python and ``pip``.
+
+If for example, you would like to use your local copy of
+icalendar in another Python environment,
+this section explains how to do it.
+
+You can install the local copy of ``icalendar`` with ``pip``
+like this:
+
+.. code-block:: bash
+
+    cd icalendar
+    python -m pip install -e .
+
+This installs the module and dependencies in your
+Python environment so that you can access local changes.
+If tox fails to install ``icalendar`` during its first run,
+you can activate the environment in the ``.tox`` folder and
+manually setup ``icalendar`` like this.
+
+Try it out:
+
+.. code-block:: python
+
+    Python 3.9.5 (default, Nov 23 2021, 15:27:38)
+    Type "help", "copyright", "credits" or "license" for more information.
+    >>> import icalendar
+    >>> icalendar.__version__
+    '4.0.10.dev0'
 
 Building the documentation locally
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -18,10 +121,7 @@ To build the documentation follow these steps:
 
 .. code-block:: bash
 
-    $ git clone https://github.com/collective/icalendar.git
-    $ cd icalendar
-    $ virtualenv-2.7 .
-    $ source bin/activate
+    $ source .tox/py39/bin/activate
     $ pip install -r requirements_docs.txt
     $ cd docs
     $ make html
diff --git a/tox.ini b/tox.ini
index 5ca22932..688d2c5f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,16 +1,15 @@
 # to run for a specific environment, use ``tox -e ENVNAME``
 [tox]
-envlist = py27,py36,py37,py38,py39,py310,pypy3
+envlist = py27,py37,py38,py39,py310,pypy3
 
 [testenv]
+usedevelop=True
 deps =
     pytest
     coverage
-    py{27,36}: hypothesis>=3.0
-extras =
-    test
+    py{27}: hypothesis>=3.0
 commands =
     coverage run --source=src/icalendar --omit=*/tests/* --module pytest []
-    py{27,36}: coverage run --append --source=src/icalendar --omit=*/tests/* --module pytest [] src/icalendar/tests/hypothesis/
+    py{27}: coverage run --append --source=src/icalendar --omit=*/tests/* --module pytest [] src/icalendar/tests/hypothesis/
     coverage report
     coverage html