diff --git a/.gitignore b/.gitignore
index 25d14856..c5f2bee7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@
 *.log
 *.csv
 build/
+docs/build/
 
 *.pkl
 *.png
diff --git a/docs/Makefile b/docs/Makefile
new file mode 100644
index 00000000..d0c3cbf1
--- /dev/null
+++ b/docs/Makefile
@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = source
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 00000000..e1b4c6cd
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,20 @@
+# CacheFlow documents
+
+## Build the docs
+
+```bash
+# Install dependencies.
+pip -r requirements-docs.txt
+
+# Build the docs.
+make clean
+make html
+```
+
+## Open the docs with your brower
+
+```bash
+cd build/html
+python -m http.server
+```
+Launch your browser and open localhost:8000.
diff --git a/docs/make.bat b/docs/make.bat
new file mode 100644
index 00000000..747ffb7b
--- /dev/null
+++ b/docs/make.bat
@@ -0,0 +1,35 @@
+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set SOURCEDIR=source
+set BUILDDIR=build
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.https://www.sphinx-doc.org/
+	exit /b 1
+)
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
new file mode 100644
index 00000000..c770f13a
--- /dev/null
+++ b/docs/requirements-docs.txt
@@ -0,0 +1,3 @@
+sphinx
+sphinx-click
+sphinx-copybutton
diff --git a/docs/source/conf.py b/docs/source/conf.py
new file mode 100644
index 00000000..7b3f6d6b
--- /dev/null
+++ b/docs/source/conf.py
@@ -0,0 +1,65 @@
+# Configuration file for the Sphinx documentation builder.
+#
+# This file only contains a selection of the most common options. For a full
+# list see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'CacheFlow'
+copyright = '2023, CacheFlow Team'
+author = 'the CacheFlow Team'
+
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    "sphinx.ext.napoleon",
+    "sphinx.ext.viewcode",
+    "sphinx.ext.intersphinx",
+    "sphinx_copybutton",
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = []
+
+# Exclude the prompt "$" when copying code
+copybutton_prompt_text = r"\$ "
+copybutton_prompt_is_regexp = True
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_title = project
+html_theme = 'sphinx_book_theme'
+html_theme_options = {
+    'path_to_docs': 'docs/source',
+    'repository_url': 'https://github.com/WoosukKwon/cacheflow',
+    'use_repository_button': True,
+}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
diff --git a/docs/source/getting_started/installation.rst b/docs/source/getting_started/installation.rst
new file mode 100644
index 00000000..aab424c6
--- /dev/null
+++ b/docs/source/getting_started/installation.rst
@@ -0,0 +1,10 @@
+Installation
+============
+
+Build from source
+-----------------
+
+.. code-block:: console
+
+    $ pip install -r requirements.txt
+    $ pip install -e .  # This may take several minutes.
diff --git a/docs/source/getting_started/quickstart.rst b/docs/source/getting_started/quickstart.rst
new file mode 100644
index 00000000..c6f18b04
--- /dev/null
+++ b/docs/source/getting_started/quickstart.rst
@@ -0,0 +1,34 @@
+Quickstart
+==========
+
+LLM
+---
+
+Placeholder.
+
+.. code-block:: python
+
+    from cacheflow import LLM, SamplingParams
+
+    # Sample prompts.
+    prompts = [
+        "Hello, my name is",
+        "The president of the United States is",
+        "The capital of France is",
+        "The future of AI is",
+    ]
+    # Create a sampling params object.
+    sampling_params = SamplingParams(temperature=0.8, top_p=0.95)
+
+    # Create an LLM.
+    llm = LLM(model="facebook/opt-125m")
+
+    # Generate texts from the prompts. The output is a list of RequestOutput objects
+    # that contain the prompt, generated text, and other information.
+    outputs = llm.generate(prompts, sampling_params)
+
+    # Print the outputs.
+    for output in outputs:
+        prompt = output.prompt
+        generated_text = output.outputs[0].text
+        print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
diff --git a/docs/source/index.rst b/docs/source/index.rst
new file mode 100644
index 00000000..d31498a8
--- /dev/null
+++ b/docs/source/index.rst
@@ -0,0 +1,12 @@
+Welcome to CacheFlow!
+=====================
+
+Documentation
+-------------
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Getting Started
+
+   getting_started/installation
+   getting_started/quickstart