1 files changed, 5 insertions, 2 deletions
diff --git a/server/permission.py b/server/permission.py
index fe93928..3ce7323 100644
--- a/server/permission.py
+++ b/server/permission.py
@@ -1,6 +1,9 @@
 # -*- coding: utf-8 -*-
 
-READ   = 1 << 0
+READ = 1 << 0
 MODIFY = 1 << 1
 APPEND = 1 << 2
-    
-\ No newline at end of file
+LIST = 1 << 3
+
+class PermissionError(Exception):
+    pass
+\ No newline at end of file