diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3abb82d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "third_party/make-env"]
+	path = third_party/make-env
+	url = git+ssh://github.com/SymbiFlow/make-env.git
diff --git a/docs/.gitignore b/docs/.gitignore
new file mode 100644
index 0000000..19ac2d0
--- /dev/null
+++ b/docs/.gitignore
@@ -0,0 +1,2 @@
+env
+_build
diff --git a/docs/Makefile b/docs/Makefile
new file mode 100644
index 0000000..c97e401
--- /dev/null
+++ b/docs/Makefile
@@ -0,0 +1,97 @@
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# The top directory where environment will be created.
+DOCS_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+TOP_DIR := $(realpath $(DOCS_DIR)/..)
+
+# A pip `requirements.txt` file.
+# https://pip.pypa.io/en/stable/reference/pip_install/#requirements-file-format
+REQUIREMENTS_FILE := $(DOCS_DIR)/requirements.txt
+
+# A conda `environment.yml` file.
+# https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html
+ENVIRONMENT_FILE := $(DOCS_DIR)/environment.yml
+
+$(TOP_DIR)/third_party/make-env/conda.mk: $(TOP_DIR)/.gitmodules
+	cd $(TOP_DIR); git submodule update --init third_party/make-env
+	touch $(TOP_DIR)/third_party/make-env/conda.mk
+
+-include $(TOP_DIR)/third_party/make-env/conda.mk
+
+SHELL = /bin/bash
+
+EXP_OPEN := $$((
+EXP_CLOSE := ))
+CPU_CORES := $(shell nproc)
+CPU_CORES_2 := $(shell echo $(EXP_OPEN) $(CPU_CORES) * 2 $(EXP_CLOSE))
+
+SPHINXOPTS      = -j $(CPU_CORES_2)
+SPHINXBUILD     = $(IN_CONDA_ENV) sphinx-build
+SPHINXAUTOBUILD = $(IN_CONDA_ENV) sphinx-autobuild
+SPHINXPROJ      = SkyWaterPDK
+SOURCEDIR       = $(DOCS_DIR)
+BUILDDIR        = $(DOCS_DIR)/_build
+
+# Put it first so that "make" without argument is like "make help".
+help: | $(CONDA_ENV_PYTHON)
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+# Vim makes a '4913' file for file system checking. Seriously.
+livehtml: | $(CONDA_ENV_PYTHON)
+	@$(SPHINXAUTOBUILD) \
+		-b html \
+		--delay 5 \
+		\
+		--ignore \*.swp \
+		--ignore \*~ \
+		--ignore env \
+		--ignore _build \
+        	--ignore .git \
+        	--ignore */4913 \
+		\
+		$(SPHINXOPTS) \
+		"$(SOURCEDIR)" \
+		"$(BUILDDIR)/html"
+
+.PHONY: help livehtml Makefile
+
+# Various automated fixups that can be run
+fixup:
+	# Make sure it is SkyWater
+	find ../ -type f -name \*.rst -exec sed -i 's/Skywater/SkyWater/gi' \{\} \+
+	# Strip trailing space
+	find ../ -type f -name \*.rst -exec sed -i 's/ \+$$//' \{\} \+
+	# Make sure all library names have the :lib: role.
+	find ../ -type f -name \*.rst -exec sed -i -e'/:name:.*/!s/\(:lib:\)\?`\?\(sky130_[a-z0-9]\+_[a-z0-9]\+\(_[a-z0-9]\+\)\?\)`\?\(\s\|$$\)/:lib:`\2`\4/g' \{\} \+
+
+.PHONY: fixup
+
+echo: | $(CONDA_ENV_PYTHON)
+	@echo '$(SPHINXBUILD) -M XXXX "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)'
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+.DEFAULT: | $(CONDA_ENV_PYTHON)
+	@make env
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+
+clean:: clean-docs
+
+
+clean-docs:
+	rm -rf _build
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 0000000..b817d54
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,419 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- 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 docutils
+import os
+import re
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+
+# -- Project information -----------------------------------------------------
+
+project = 'SkyWater SKY130 PDK'
+copyright = '2020, SkyWater PDK Authors'
+author = 'SkyWater PDK Authors'
+
+# The short X.Y version
+version = ''
+# The full version, including alpha/beta/rc tags
+release = ''
+
+
+# -- General configuration ---------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# 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.autodoc',
+    'sphinx.ext.autosectionlabel',
+    'sphinx.ext.githubpages',
+    'sphinx.ext.ifconfig',
+    'sphinx.ext.mathjax',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.todo',
+    'sphinxcontrib_hdl_diagrams',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# Enable github links when not on readthedocs
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if not on_rtd:
+    html_context = {
+        "display_github": True,         # Integrate GitHub
+        "github_user": "google",        # Username
+        "github_repo": "skywater-pdk",  # Repo name
+        "github_version": "master",     # Version
+        "conf_py_path": "/doc/",
+    }
+else:
+    docs_dir = os.path.abspath(os.path.dirname(__file__))
+    print("Docs dir is:", docs_dir)
+    import subprocess
+    subprocess.call('git fetch origin --unshallow', cwd=docs_dir, shell=True)
+    subprocess.check_call('git fetch origin --tags', cwd=docs_dir, shell=True)
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The full version, including alpha/beta/rc tags.
+release = re.sub('^v', '', os.popen('git describe ').read().strip())
+# The short X.Y version.
+version = release
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# 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 = [
+    '_build',
+    'env',
+    'Thumbs.db',
+    '.DS_Store',
+    # Files included in other rst files.
+    'code-of-conduct.rst',
+    'rules/periphery-rules.rst',
+    'rules/device-details/*/index.rst',
+]
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+
+# -- Options for HTML output -------------------------------------------------
+
+# Prefix each section label with the name of the document it is in, followed by
+# a colon. For example, index:Introduction for a section called Introduction
+# that appears in document index.rst. Useful for avoiding ambiguity when the
+# same section heading appears in different documents.
+#autosectionlabel_prefix_document = 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_theme = "sphinx_symbiflow_theme"
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+html_theme_options = {
+    # Specify a list of menu in Header.
+    # Tuples forms:
+    #  ('Name', 'external url or path of pages in the document', boolean, 'icon name')
+    #
+    # Third argument:
+    # True indicates an external link.
+    # False indicates path of pages in the document.
+    #
+    # Fourth argument:
+    # Specify the icon name.
+    # For details see link.
+    # https://material.io/icons/
+    'header_links': [
+        ('Home', 'index', False, 'home'),
+        ("GitHub", "https://github.com/google/skywater-pdk", True, 'code'),
+        ("SkyWater", "https://www.skywatertechnology.com/", True, 'link'),
+    ],
+
+    # Customize css colors.
+    # For details see link.
+    # https://getmdl.io/customize/index.html
+    #
+    # Values: amber, blue, brown, cyan deep_orange, deep_purple, green, grey, indigo, light_blue,
+    #         light_green, lime, orange, pink, purple, red, teal, yellow(Default: indigo)
+    'primary_color': 'light_green',
+    # Values: Same as primary_color. (Default: pink)
+    'accent_color': 'teal',
+
+    # Customize layout.
+    # For details see link.
+    # https://getmdl.io/components/index.html#layout-section
+    'fixed_drawer': True,
+    'fixed_header': True,
+    'header_waterfall': True,
+    'header_scroll': False,
+
+    # Render title in header.
+    # Values: True, False (Default: False)
+    'show_header_title': False,
+    # Render title in drawer.
+    # Values: True, False (Default: True)
+    'show_drawer_title': True,
+    # Render footer.
+    # Values: True, False (Default: True)
+    'show_footer': True,
+
+    # Hide the symbiflow links
+    'hide_symbiflow_links': True,
+    'license_url' : 'https://www.apache.org/licenses/LICENSE-2.0',
+}
+
+# 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']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+
+# -- Options for HTMLHelp output ---------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'skywater-pdk-doc'
+
+
+# -- Options for LaTeX output ------------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (
+        # source start file
+        master_doc,
+        # target name
+        'skywater-pdk.tex',
+        # title
+        'SkyWater SKY130 PDK Documentation',
+        # author
+        author,
+        # document class
+        'manual',
+    ),
+]
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'skywater-pdk', 'SkyWater SKY130 PDK Documentation',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output ----------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (
+        # source start file
+        master_doc,
+        # target name
+        'skywater-pdk',
+        # title
+        'SkyWater SKY130 PDK Documentation',
+        # author
+        author,
+        # dir menu entry
+        'SkyWater SKY130 PDK',
+        # description
+        'Documentation for open source PDK targetting SkyWater SKY130 process node.',
+        # category
+        'Miscellaneous',
+    ),
+]
+
+# -- Options for Epub output -------------------------------------------------
+
+# Bibliographic Dublin Core info.
+epub_title = project
+
+# The unique identifier of the text. This can be a ISBN number
+# or the project homepage.
+#
+# epub_identifier = ''
+
+# A unique identification for the text.
+#
+# epub_uid = ''
+
+# A list of files that should not be packed into the epub file.
+epub_exclude_files = ['search.html']
+
+# Enable the figures and numbers
+numfig = True
+
+# -- Extension configuration -------------------------------------------------
+
+# -- Options for todo extension ----------------------------------------------
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = True
+
+
+import re
+from docutils.parsers.rst import directives, roles, nodes
+
+LIB_REGEX = re.compile('sky130_(?P<lib_src>[^_\s]*)_(?P<lib_type>[^_\s]*)(_(?P<lib_name>[^_\s]*))?')
+CELL_REGEX = re.compile('sky130_(?P<lib_src>[^_\s]*)_(?P<lib_type>[^_\s]*)(_(?P<lib_name>[^_\s]*))?__(?P<cell_name>[^\s]*)')
+
+def lib_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
+    """Library name which gets colorized."""
+    m = LIB_REGEX.match(text)
+    if not m:
+        msg = inliner.reporter.error("Malformed library name of "+repr(text), line=lineno)
+        prb = inliner.problematic(rawtext, rawtext, msg)
+        return [prb], [msg]
+    app = inliner.document.settings.env.app
+
+    #lib_process_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_src_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_type_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_name_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    lib_process = 'sky130'
+    lib_src = m.group('lib_src')
+    lib_type = m.group('lib_type')
+    lib_name = m.group('lib_name')
+
+    r = [
+        nodes.inline(lib_process, lib_process, classes=['lib-process']),
+        nodes.inline('_', '_', options=options),
+        nodes.inline(lib_src, lib_src, classes=['lib-src']),
+        nodes.inline('_', '_', options=options),
+        nodes.inline(lib_type, lib_type, classes=['lib-type']),
+    ]
+    if lib_name:
+        r.append(nodes.inline('_', '_', options=options))
+        r.append(nodes.inline(lib_name, lib_name, classes=['lib-name']))
+
+    return r, []
+
+
+def cell_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
+    """Cell name which gets colorized."""
+    m = CELL_REGEX.match(text)
+    if not m:
+        msg = inliner.reporter.error("Malformed cell name of "+repr(text), line=lineno)
+        prb = inliner.problematic(rawtext, rawtext, msg)
+        return [prb], [msg]
+    app = inliner.document.settings.env.app
+
+    #lib_process_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_src_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_type_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    #lib_name_role = roles.role('lib_src', inliner.language, lineno, inliner.reporter)
+    lib_process = 'sky130'
+    lib_src = m.group('lib_src')
+    lib_type = m.group('lib_type')
+    lib_name = m.group('lib_name')
+    cell_name = m.group('cell_name')
+
+    r = [
+        nodes.inline(lib_process, lib_process, classes=['lib-process']),
+        nodes.inline('_', '_', options=options),
+        nodes.inline(lib_src, lib_src, classes=['lib-src']),
+        nodes.inline('_', '_', options=options),
+        nodes.inline(lib_type, lib_type, classes=['lib-type']),
+    ]
+    if lib_name:
+        r.append(nodes.inline('_', '_', options=options))
+        r.append(nodes.inline(lib_name, lib_name, classes=['lib-name']))
+    r.append(nodes.inline('__', '__', options=options))
+    r.append(nodes.inline(cell_name, cell_name, classes=['cell-name']))
+
+    return r, []
+
+
+def add_role(app, new_role_name):
+    options = {
+        'class': directives.class_option(new_role_name),
+    }
+    role = roles.CustomRole(new_role_name, roles.generic_custom_role, options, "")
+    app.add_role(new_role_name, role)
+
+
+def setup(app):
+    app.add_css_file('extra.css')
+    add_role(app, 'cell_name')
+    add_role(app, 'lib_process')
+    add_role(app, 'lib_src')
+    add_role(app, 'lib_type')
+    add_role(app, 'lib_name')
+    add_role(app, 'drc_rule')
+    add_role(app, 'drc_tag')
+    add_role(app, 'drc_flag')
+    add_role(app, 'layer')
+
+    app.add_role('lib', lib_role)
+    app.add_role('cell', cell_role)
+    app.add_role('model', cell_role)
diff --git a/docs/environment.yml b/docs/environment.yml
new file mode 100644
index 0000000..23797fd
--- /dev/null
+++ b/docs/environment.yml
@@ -0,0 +1,28 @@
+# Copyright 2020 SkyWater PDK Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+name: skywater-pdk-docs
+channels:
+- symbiflow
+- conda-forge
+- defaults
+dependencies:
+- python=3.8
+- pip
+- yosys
+- netlistsvg
+# Packages installed from PyPI
+- pip:
+  - -r file:requirements.txt
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..f20b3a6
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,21 @@
+git+https://github.com/SymbiFlow/sphinx_materialdesign_theme.git#egg=sphinx-symbiflow-theme
+
+docutils
+sphinx
+sphinx-autobuild
+
+# Verilog domain
+sphinx-verilog-domain
+# Verilog diagrams using Yosys + netlistsvg
+sphinxcontrib-hdl-diagrams
+
+# Module diagrams
+git+https://github.com/SymbiFlow/symbolator.git#egg=symbolator
+
+# pycairo
+# vext.gi
+
+restructuredtext-lint
+rstdoc
+
+tabulate
diff --git a/third_party/make-env b/third_party/make-env
new file mode 160000
index 0000000..ea960c7
--- /dev/null
+++ b/third_party/make-env
@@ -0,0 +1 @@
+Subproject commit ea960c7821f03d81c4f10dc1e7515a5c4546cf28