diff --git a/attributs.py b/attributs.py
index 49dd37b..d25b22d 100644
--- a/attributs.py
+++ b/attributs.py
@@ -131,6 +131,57 @@ def attrify(val, attr, conn, Parent=None):
             val = val.decode('utf-8')
         return attr_classe(val, conn, Parent)
 
+class AttrsList(list):
+    def __init__(self, Parent, attr, attr_list):
+        super(AttrsList, self).__init__(attr_list)
+        self._parent = Parent
+        self._attr = attr
+
+    def _start(self):
+        if self._parent[self._attr] != self:
+            raise ValueError("La variable que vous utilisez n'est pas à jour (modifications conccurentes ?)")
+
+    def _commit(self):
+        try:
+            self._parent[self._attr] = self
+        finally:
+            super(AttrsList, self).__init__(self._parent[self._attr])
+
+    def append(self, val):
+        self._start()
+        super(AttrsList, self).append(val)
+        self._commit()
+
+    def extend(self, vals):
+        self._start()
+        super(AttrsList, self).extend(vals)
+        self._commit()
+
+    def insert(self, pos, val):
+        self._start()
+        super(AttrsList, self).insert(pos, val)
+        self._commit()
+
+    def remove(self, val):
+        self._start()
+        super(AttrsList, self).remove(val)
+        self._commit()
+
+    def sort(self):
+        self._start()
+        super(AttrsList, self).sort()
+        self._commit()
+
+    def pop(self, index=None):
+        self._start()
+        ret = super(AttrsList, self).pop(index) if index else super(AttrsList, self).pop()
+        self._commit()
+        return ret
+
+    def reverse(self):
+        self._start()
+        super(AttrsList, self).reverse()
+        self._commit()
 
 class AttrsDict(dict):
     def __init__(self, conn, uldif={}, Parent=None):
diff --git a/objets.py b/objets.py
index 4d6c07b..eab4177 100644
--- a/objets.py
+++ b/objets.py
@@ -396,11 +396,11 @@ class CransLdapObject(object):
 
     def __getitem__(self, attr, default=None):
         if self._modifs.has_key(attr) and self.mode in [ 'w', 'rw' ]:
-            return [ v for v in self._modifs[attr] ]
+            return attributs.AttrsList(self, attr, [ v for v in self._modifs[attr] ])
         elif self.attrs.has_key(attr):
-            return [ v for v in self.attrs[attr] ]
+            return attributs.AttrsList(self, attr, [ v for v in self.attrs[attr] ])
         elif self.has_key(attr):
-            return [] if default is None else default
+            return attributs.AttrsList(self, attr, []) if default is None else default
         raise KeyError(attr)
 
     def has_key(self, attr):