diff --git a/README.md b/README.md
index 37aba65..124f51c 100644
--- a/README.md
+++ b/README.md
@@ -1,36 +1,128 @@
-[![PyPI version panoptica](https://badge.fury.io/py/auxiliary.svg)](https://pypi.python.org/pypi/auxiliary/)
+# auxiliary
+
+[![Python Versions](https://img.shields.io/pypi/pyversions/auxiliary)](https://pypi.org/project/auxiliary/)
+[![Stable Version](https://img.shields.io/pypi/v/auxiliary?label=stable)](https://pypi.org/project/auxiliary/)
 [![Documentation Status](https://readthedocs.org/projects/auxiliary/badge/?version=latest)](http://auxiliary.readthedocs.io/?badge=latest)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
-# auxiliary
+Auxiliary is a Python package providing utility functions for medical image processing. It is part of the [BrainLesion](https://github.com/BrainLesion) project and offers tools for:
 
-TODO
+- **Image I/O**: Reading and writing medical images (NIfTI, TIFF, DICOM) using SimpleITK
+- **Image Normalization**: Percentile-based and windowing normalization methods
+- **Format Conversion**: DICOM to NIfTI and NIfTI to DICOM conversion
+- **Path Utilities**: Robust path handling with the turbopath module
 
 ## Installation
 
-### PyPi
+With a Python 3.10+ environment, you can install `auxiliary` directly from [PyPI](https://pypi.org/project/auxiliary/):
 
-```sh
+```bash
 pip install auxiliary
 ```
 
-### Conda
+Or via conda:
 
-```sh
+```bash
 conda install conda-forge::auxiliary
 ```
 
-## deploy
+### Optional Dependencies
+
+For DICOM to NIfTI conversion using `dcm2niix`:
+
+```bash
+pip install auxiliary[dcm2niix]
+```
+
+## Usage
+
+### NIfTI I/O
+
+```python
+from auxiliary.io import read_image, write_image
+
+# Read a NIfTI image
+image_array = read_image("path/to/image.nii.gz")
+
+# Write a NumPy array to a NIfTI file
+write_image(image_array, "path/to/output.nii.gz")
+
+# Write with reference image for spatial metadata
+write_image(image_array, "path/to/output.nii.gz", reference_path="path/to/reference.nii.gz")
+```
+
+### DICOM I/O
+
+```python
+from auxiliary.conversion import dicom_to_nifti_itk, nifti_to_dicom_itk, dcm2niix
+import numpy as np
+
+# Read a DICOM series and convert to NIfTI using SimpleITK
+dicom_to_nifti_itk("path/to/dicom_dir", "path/to/output_dir")
+
+# Read a DICOM series and convert to NIfTI using dcm2niix (requires dcm2niix extra)
+dcm2niix("path/to/dicom_dir", "path/to/output_dir")
+
+# Write a NIfTI image to DICOM format
+nifti_to_dicom_itk("path/to/image.nii.gz", "path/to/output_dicom_dir")
+
+# Write a NumPy array to DICOM format
+image_array = np.random.rand(128, 128, 64)  # example 3D array
+nifti_to_dicom_itk(image_array, "path/to/output_dicom_dir")
+
+# Write a NumPy array to DICOM with reference DICOM for metadata
+nifti_to_dicom_itk(
+    image_array,
+    "path/to/output_dicom_dir",
+    reference_dicom="path/to/reference_dicom_dir"
+)
+```
+
+### TIFF I/O
 
-### build
+```python
+from auxiliary.tiff.io import read_tiff, write_tiff
 
+# Read a TIFF file
+tiff_data = read_tiff("path/to/image.tiff")
+
+# Write a NumPy array to a TIFF file
+write_tiff(tiff_data, "path/to/output.tiff")
 ```
-python -m build
-poetry build
+
+### Image Normalization
+
+```python
+from auxiliary.normalization.percentile_normalizer import PercentileNormalizer
+from auxiliary.normalization.windowing_normalizer import WindowingNormalizer
+
+# Percentile-based normalization
+normalizer = PercentileNormalizer(lower_percentile=1.0, upper_percentile=99.0)
+normalized_image = normalizer.normalize(image_array)
+
+# Windowing normalization (e.g., for CT images)
+normalizer = WindowingNormalizer(center=40, width=400)
+windowed_image = normalizer.normalize(image_array)
 ```
 
-### upload to pypi
+
+
+## Citation
+
+> [!IMPORTANT]
+> If you use `auxiliary` in your research, please cite it to support the development!
+
+Kofler, F., Rosier, M., Astaraki, M., Möller, H., Mekki, I. I., Buchner, J. A., Schmick, A., Pfiffer, A., Oswald, E., Zimmer, L., Rosa, E. de la, Pati, S., Canisius, J., Piffer, A., Baid, U., Valizadeh, M., Linardos, A., Peeken, J. C., Shit, S., … Menze, B. (2025). *BrainLesion Suite: A Flexible and User-Friendly Framework for Modular Brain Lesion Image Analysis* [arXiv preprint arXiv:2507.09036](https://doi.org/10.48550/arXiv.2507.09036)
+
 
 ```
-twine upload dist/*
+@misc{kofler2025brainlesionsuiteflexibleuserfriendly,
+      title={BrainLesion Suite: A Flexible and User-Friendly Framework for Modular Brain Lesion Image Analysis}, 
+      author={Florian Kofler and Marcel Rosier and Mehdi Astaraki and Hendrik Möller and Ilhem Isra Mekki and Josef A. Buchner and Anton Schmick and Arianna Pfiffer and Eva Oswald and Lucas Zimmer and Ezequiel de la Rosa and Sarthak Pati and Julian Canisius and Arianna Piffer and Ujjwal Baid and Mahyar Valizadeh and Akis Linardos and Jan C. Peeken and Surprosanna Shit and Felix Steinbauer and Daniel Rueckert and Rolf Heckemann and Spyridon Bakas and Jan Kirschke and Constantin von See and Ivan Ezhov and Marie Piraud and Benedikt Wiestler and Bjoern Menze},
+      year={2025},
+      eprint={2507.09036},
+      archivePrefix={arXiv},
+      primaryClass={cs.CV},
+      url={https://arxiv.org/abs/2507.09036}, 
+}
 ```
diff --git a/pyproject.toml b/pyproject.toml
index 0c04682..3152092 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ name = "auxiliary"
 version = "0.0.0"
 description = "TODO."
 authors = ["Florian Kofler <florian.kofler@tum.de>"]
-license = "AGPL-3.0"
+license = "Apache-2.0"
 
 readme = "README.md"
 repository = "https://github.com/BrainLesion/auxiliary"