diff --git a/beetsplug/plexupdate.py b/beetsplug/plexupdate.py
index 3bfcba4c0..c61766c43 100644
--- a/beetsplug/plexupdate.py
+++ b/beetsplug/plexupdate.py
@@ -21,7 +21,7 @@ def get_music_section(host, port):
     """Getting the section key for the music library in Plex.
     """
     api_endpoint = 'library/sections'
-    url = urljoin('http://{}:{}'.format(host, port), api_endpoint)
+    url = urljoin('http://{0}:{1}'.format(host, port), api_endpoint)
 
     # Sends request.
     r = requests.get(url)
@@ -38,8 +38,8 @@ def update_plex(host, port):
     """
     # Getting section key and build url.
     section_key = get_music_section(host, port)
-    api_endpoint = 'library/sections/{}/refresh'.format(section_key)
-    url = urljoin('http://{}:{}'.format(host, port), api_endpoint)
+    api_endpoint = 'library/sections/{0}/refresh'.format(section_key)
+    url = urljoin('http://{0}:{1}'.format(host, port), api_endpoint)
 
     # Sends request and returns requests object.
     r = requests.get(url)
diff --git a/docs/plugins/plexupdate.rst b/docs/plugins/plexupdate.rst
index b051f24b5..09ff940de 100644
--- a/docs/plugins/plexupdate.rst
+++ b/docs/plugins/plexupdate.rst
@@ -4,8 +4,6 @@ PlexUpdate Plugin
 ``plexupdate`` is a very simple plugin for beets that lets you automatically
 update `Plex`_'s music library whenever you change your beets library.
 
-.. _Plex: http://plex.tv/
-
 To use ``plexupdate`` plugin, enable it in your configuration
 (see :ref:`using-plugins`).
 Then, you'll probably want to configure the specifics of your Plex server.
@@ -14,11 +12,18 @@ which looks like this::
 
     plex:
         host: localhost
-        port: 32400 
+        port: 32400
+
+To use the ``plexupdate`` plugin you need to install the `requests`_ library with:
+
+    pip install requests
 
 With that all in place, you'll see beets send the "update" command to your Plex 
 server every time you change your beets library.
 
+.. _Plex: http://plex.tv/
+.. _requests: http://docs.python-requests.org/en/latest/
+
 Configuration
 -------------