diff --git a/mopidy/backends/local/__init__.py b/mopidy/backends/local/__init__.py
index 0f9b7502..436f43d4 100644
--- a/mopidy/backends/local/__init__.py
+++ b/mopidy/backends/local/__init__.py
@@ -111,18 +111,20 @@ class Library(object):
         """
         raise NotImplementedError
 
-    # TODO: support case with returning all tracks?
-    # TODO: remove uris?
+    # TODO: remove uris, replacing it with support in query language.
+    # TODO: remove exact, replacing it with support in query language.
     def search(self, query=None, exact=False, uris=None):
         """
         Search the library for tracks where ``field`` contains ``values``.
 
         :param query: one or more queries to search for
         :type query: dict
-        :param exact: look for exact matches?
+        :param exact: whether to look for exact matches
         :type query: boolean
         :param uris: zero or more URI roots to limit the search to
         :type uris: list of strings or :class:`None`
         :rtype: :class:`mopidy.models.SearchResult`
         """
         raise NotImplementedError
+
+    # TODO: add file browsing support.
diff --git a/mopidy/backends/local/library.py b/mopidy/backends/local/library.py
index eadea027..d8cc2320 100644
--- a/mopidy/backends/local/library.py
+++ b/mopidy/backends/local/library.py
@@ -4,11 +4,12 @@ import logging
 
 from mopidy.backends import base
 
-logger = logging.getLogger('mopidy.backends.local')
+logger = logging.getLogger('mopidy.backends.local.library')
 
 
 class LocalLibraryProvider(base.BaseLibraryProvider):
     """Proxy library that delegates work to our active local library."""
+
     def __init__(self, backend, library):
         super(LocalLibraryProvider, self).__init__(backend)
         self._library = library
@@ -25,7 +26,7 @@ class LocalLibraryProvider(base.BaseLibraryProvider):
         if not self._library:
             return []
         track = self._library.lookup(uri)
-        if not uri:
+        if track is None:
             logger.debug('Failed to lookup %r', uri)
             return []
         return [track]