diff --git a/docs/source/conf.py b/docs/source/conf.py
index 386c386..9a8dc9b 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -32,6 +32,7 @@ release = '0.1'
 # ones.
 extensions = [
     'sphinx.ext.napoleon',
+    'sphinx_rtd_theme',
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -48,7 +49,7 @@ exclude_patterns = []
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-html_theme = 'alabaster'
+html_theme = 'sphinx_rtd_theme'
 
 # 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,
diff --git a/frank/module/decorators/classes.py b/frank/module/decorators/classes.py
index 3e93be1..d14e398 100644
--- a/frank/module/decorators/classes.py
+++ b/frank/module/decorators/classes.py
@@ -87,7 +87,7 @@ class RegexCommand(Command):
 
         Args:
             prefix: string to match pattern against; Pattern must match entire
-            prefix
+                prefix
         """
 
         return bool(re.fullmatch(self.cmd, prefix))
diff --git a/requirements-dev.txt b/requirements-dev.txt
index abf950d..5059612 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -12,3 +12,4 @@ pytest>=6.0.1,<7.0.0
 pytest-asyncio>=0.14.0,<1.0.0
 twine>=3.2.0,<4.0.0
 Sphinx==3.2.1
+sphinx-rtd-theme==0.5.0