diff --git a/adafruit_pca9685.py b/adafruit_pca9685.py
index e321231..586d363 100755
--- a/adafruit_pca9685.py
+++ b/adafruit_pca9685.py
@@ -74,7 +74,7 @@ def duty_cycle(self, value):
             self._pca.pwm_regs[self._index].__set__(self._pca, (0, value))
 
 class PCAChannels: # pylint: disable=too-few-public-methods
-    """Lazily creates and caches channel objects as needed."""
+    """Lazily creates and caches channel objects as needed. Treat it like a sequence."""
     def __init__(self, pca):
         self._pca = pca
         self._channels = [None] * len(self)
@@ -122,7 +122,9 @@ class PCA9685:
     def __init__(self, i2c_bus, *, address=0x40, reference_clock_speed=25000000):
         self.i2c_device = i2c_device.I2CDevice(i2c_bus, address)
         self.channels = PCAChannels(self)
+        """Sequence of 16 `PWMChannel` objects. One for each channel."""
         self.reference_clock_speed = reference_clock_speed
+        """The reference clock speed in Hz."""
         self.reset()
 
     def reset(self):
diff --git a/api.rst b/api.rst
index 3d29319..8d7d6a5 100644
--- a/api.rst
+++ b/api.rst
@@ -1,5 +1,5 @@
 
 .. If you created a package, create one automodule per module in the package.
 
-.. automodule:: adafruit_thermistor
+.. automodule:: adafruit_pca9685
    :members:
diff --git a/conf.py b/conf.py
new file mode 100644
index 0000000..0f06c9e
--- /dev/null
+++ b/conf.py
@@ -0,0 +1,146 @@
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+sys.path.insert(0, os.path.abspath('.'))
+
+# -- 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.autodoc',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.viewcode',
+]
+
+intersphinx_mapping = {'python': ('https://docs.python.org/3.4', None),
+                       'CircuitPython': ('https://circuitpython.readthedocs.io/en/latest/', None)}
+
+# Libraries we depend on but don't need for generating docs.
+autodoc_mock_imports = ['adafruit_bus_device', 'adafruit_register']
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'README'
+
+# General information about the project.
+project = u'Adafruit PCA9685 Library'
+copyright = u'2016 Radomir Dopieralski, 2017 Scott Shawcroft'
+author = u'Radomir Dopieralski'
+
+# 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 short X.Y version.
+version = u'1.0'
+# The full version, including alpha/beta/rc tags.
+release = u'1.0'
+
+# 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 patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', '.env']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#
+default_role = "any"
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#
+add_function_parentheses = True
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+
+if not on_rtd:  # only import and set the theme if we're building docs locally
+    try:
+        import sphinx_rtd_theme
+        html_theme = 'sphinx_rtd_theme'
+        html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), '.']
+    except:
+        html_theme = 'default'
+        html_theme_path = ['.']
+else:
+    html_theme_path = ['.']
+
+# 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']
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'AdafruitPCA9685Librarydoc'
+
+# -- 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 = [
+    (master_doc, 'AdafruitPCA9685Library.tex', u'Adafruit PCA9685 Library Documentation',
+     author, '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, 'adafruitPCA9685library', u'Adafruit PCA9685 Library 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 = [
+    (master_doc, 'AdafruitPCA9685Library', u'Adafruit PCA9685 Library Documentation',
+     author, 'AdafruitPCA9685Library', 'One line description of project.',
+     'Miscellaneous'),
+]