Improve packaging.database documentation
diff --git a/Lib/packaging/database.py b/Lib/packaging/database.py
index b2fcb97..e028dc5 100644
--- a/Lib/packaging/database.py
+++ b/Lib/packaging/database.py
@@ -19,6 +19,7 @@
     'get_distributions', 'get_distribution', 'get_file_users',
     'provides_distribution', 'obsoletes_distribution',
     'enable_cache', 'disable_cache', 'clear_cache',
+    # XXX these functions' names look like get_file_users but are not related
     'get_file_path', 'get_file']