diff --git a/docs/extensiondev.rst b/docs/extensiondev.rst
index 7fa19f7a..75dcc32c 100644
--- a/docs/extensiondev.rst
+++ b/docs/extensiondev.rst
@@ -222,8 +222,10 @@ file::
     include README.rst
     include mopidy_soundspot/ext.conf
 
-For details on the ``MANIFEST.in`` file format, check out the `distuitls docs
+For details on the ``MANIFEST.in`` file format, check out the `distutils docs
 <http://docs.python.org/2/distutils/sourcedist.html#manifest-template>`_.
+`check-manifest <https://pypi.python.org/pypi/check-manifest>`_ is a very
+useful tool to check your ``MANIFEST.in`` file for completeness.
 
 
 Example __init__.py