diff --git a/README.md b/README.md
index 5d2c576..300a096 100644
--- a/README.md
+++ b/README.md
@@ -14,10 +14,16 @@ Information of CellTypist can be also found in our CellTypist portal. [![Website
 
 # Install CellTypist
 ### Using pip [![PyPI](https://img.shields.io/pypi/v/celltypist.svg?color=brightgreen&style=flat)](https://pypi.org/project/celltypist)
+Install the core package:
 ```console
 pip install celltypist
 ```
 
+To include additional dependencies for tutorials and documentation, install with the [doc] extras:
+```console
+pip install celltypist[doc]
+```
+
 ### Using conda [![install with bioconda](https://img.shields.io/conda/vn/bioconda/celltypist.svg?color=brightgreen&style=flat)](https://anaconda.org/bioconda/celltypist)
 ```console
 conda install -c bioconda -c conda-forge celltypist
diff --git a/requirements-doc.txt b/requirements-doc.txt
new file mode 100644
index 0000000..f77b05f
--- /dev/null
+++ b/requirements-doc.txt
@@ -0,0 +1 @@
+leidenalg>=0.9.0
diff --git a/requirements.txt b/requirements.txt
index 8a2fbf4..ce7ff6d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,3 @@ openpyxl>=3.0.4
 click>=7.1.2
 requests>=2.23.0
 scanpy>=1.7.0
-leidenalg>=0.9.0
diff --git a/setup.py b/setup.py
index 63eea14..b577e26 100644
--- a/setup.py
+++ b/setup.py
@@ -4,8 +4,8 @@ def get_readme():
     with open("README.md", "rt", encoding="utf-8") as fh:
         return fh.read()
 
-def get_requirements():
-    with open("requirements.txt", "rt", encoding="utf-8") as fh:
+def get_requirements(requirements_file: str):
+    with open(requirements_file, "rt", encoding="utf-8") as fh:
         return [line.strip() for line in fh.readlines()]
 
 def get_version():
@@ -26,7 +26,10 @@ def get_version():
     long_description_content_type="text/markdown",
     url="https://github.com/Teichlab/celltypist",
     packages=setuptools.find_packages(),
-    install_requires=get_requirements(),
+    install_requires=get_requirements("requirements.txt"),
+    extras_require={
+        "doc": get_requirements("requirements-doc.txt"),
+    },
     include_package_data=True,
     entry_points={
         'console_scripts': ['celltypist=celltypist.command_line:main'],