diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
index aafcb253..edd4d190 100644
--- a/doc/sphinx/conf.py
+++ b/doc/sphinx/conf.py
@@ -13,17 +13,18 @@
 # 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 = 'Freedom Metal'
-copyright = '2019, SiFive Inc.'
-author = 'SiFive Inc.'
+project = "Freedom Metal"
+copyright = "2019, SiFive Inc."
+author = "SiFive Inc."
 
-version = os.environ['RELEASE_TAG']
+version = os.environ["RELEASE_TAG"]
 release = version
 
 
@@ -36,26 +37,23 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = [
-        "breathe",
-        "sphinx.ext.graphviz"
-]
+extensions = ["breathe", "sphinx.ext.graphviz"]
 
 breathe_projects = {
-        "metal" : "../xml/",
+    "metal": "../xml/",
 }
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['metal_templates']
+templates_path = ["metal_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 #
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -70,7 +68,7 @@
 exclude_patterns = []
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = "sphinx"
 
 # This tells Sphinx to ignore the `__inline__` function attribute, fixing
 # errors related to parsing the function signature of functions marked `__inline__`.
@@ -82,7 +80,7 @@
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # 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
@@ -93,7 +91,7 @@
 # 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 = ['metal_static']
+html_static_path = ["metal_static"]
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
@@ -104,13 +102,15 @@
 # 'searchbox.html']``.
 #
 # html_sidebars = {}
-html_sidebars = { '**': ['about.html', 'navigation.html', 'relations.html', 'searchbox.html']}
+html_sidebars = {
+    "**": ["about.html", "navigation.html", "relations.html", "searchbox.html"]
+}
 
 
 # -- Options for HTMLHelp output ---------------------------------------------
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'FreedomMetaldoc'
+htmlhelp_basename = "FreedomMetaldoc"
 
 
 # -- Options for LaTeX output ------------------------------------------------
@@ -119,15 +119,12 @@
     # 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',
@@ -137,8 +134,13 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'FreedomMetal.tex', 'Freedom Metal Documentation',
-     'SiFive Inc.', 'manual'),
+    (
+        master_doc,
+        "FreedomMetal.tex",
+        "Freedom Metal Documentation",
+        "SiFive Inc.",
+        "manual",
+    ),
 ]
 
 
@@ -146,10 +148,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'freedommetal', 'Freedom Metal Documentation',
-     [author], 1)
-]
+man_pages = [(master_doc, "freedommetal", "Freedom Metal Documentation", [author], 1)]
 
 
 # -- Options for Texinfo output ----------------------------------------------
@@ -158,7 +157,13 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'FreedomMetal', 'Freedom Metal Documentation',
-     author, 'FreedomMetal', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "FreedomMetal",
+        "Freedom Metal Documentation",
+        author,
+        "FreedomMetal",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]