diff --git a/docs/index.rst b/docs/index.rst
index a6a45cb..4406824 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -159,6 +159,11 @@ must match the redirect URI added to your application in your Dashboard.
 The redirect URI can be any valid URI (it does not need to be accessible)
 such as ``http://example.com``, ``http://localhost`` or ``http://127.0.0.1:9090``.
 
+    .. note:: If you choose an `http`-scheme URL, and it's for `localhost` or
+     `127.0.0.1`, **AND** it specifies a port, then spotispy will instantiate
+      a server on the indicated response to receive the access token from the
+      response at the end of the oauth flow [see the code](https://github.com/plamere/spotipy/blob/master/spotipy/oauth2.py#L483-L490).
+
 
 Client Credentials Flow
 =======================