diff --git a/beetsplug/web/__init__.py b/beetsplug/web/__init__.py
index e49fde046..3c18ebd5d 100644
--- a/beetsplug/web/__init__.py
+++ b/beetsplug/web/__init__.py
@@ -371,10 +371,11 @@ class WebPlugin(BeetsPlugin):
         cmd.func = func
         return [cmd]
 
+
 class ReverseProxied(object):
-    '''Wrap the application in this middleware and configure the 
-    front-end server to add these headers, to let you quietly bind 
-    this to a URL other than / and to an HTTP scheme that is 
+    '''Wrap the application in this middleware and configure the
+    front-end server to add these headers, to let you quietly bind
+    this to a URL other than / and to an HTTP scheme that is
     different than what is used locally.
 
     In nginx:
@@ -386,6 +387,8 @@ class ReverseProxied(object):
         proxy_set_header X-Script-Name /myprefix;
         }
 
+    From: http://flask.pocoo.org/snippets/35/
+
     :param app: the WSGI application
     '''
     def __init__(self, app):