diff --git a/tiramisu/storage/__init__.py b/tiramisu/storage/__init__.py
index 5476f26..ee74c16 100644
--- a/tiramisu/storage/__init__.py
+++ b/tiramisu/storage/__init__.py
@@ -21,7 +21,9 @@
 
 """Storage connections, executions and managements.
 
-Storage is basic components used to set informations in DB
+Storage is basic components used to set Config informations in DB.
+The primary "entry point" class into this package is the StorageType and it's
+public configurator ``set_storage()``.
 """
 
 
@@ -31,6 +33,10 @@ from tiramisu.i18n import _
 
 
 class StorageType(object):
+    """Object to store storage's type. If a Config is already set,
+    default storage is store as selected storage. You cannot change it
+    after.
+    """
     default_storage = 'dictionary'
     storage_type = None
     mod = None
@@ -57,6 +63,13 @@ storage_type = StorageType()
 
 
 def set_storage(name, **args):
+    """Change storage's configuration
+
+    :params name: is the storage name. If storage is already set, cannot
+        reset storage name
+
+    Other attributes are differents according to the selected storage's name
+    """
     storage_type.set(name)
     settings = storage_type.get().Setting()
     for option, value in args.items():
@@ -80,11 +93,16 @@ def get_storage(context, session_id, persistent):
 
 
 def list_sessions():
+    """List all available session (persistent or not persistent)
+    """
     return storage_type.get().list_sessions()
 
 
 def delete_session(session_id):
+    """Delete a selected session, be careful, you can deleted a session
+    use by an other instance
+    """
     return storage_type.get().delete_session(session_id)
 
 
-#__all__ = (,)
+__all__ = (set_storage, list_sessions, delete_session)