diff --git a/mopidy/core/library.py b/mopidy/core/library.py
index c787e013..ae6e63ad 100644
--- a/mopidy/core/library.py
+++ b/mopidy/core/library.py
@@ -41,8 +41,8 @@ class LibraryController(object):
         Browse directories and tracks at the given ``uri``.
 
         ``uri`` is a string which represents some directory belonging to a
-        backend. To get the intial root directories for backends pass None as
-        the URI.
+        backend. To get the intial root directories for backends pass
+        :class:`None` as the URI.
 
         Returns a list of :class:`mopidy.models.Ref` objects for the
         directories and tracks at the given ``uri``.