diff --git a/nemubot/tools/xmlparser/node.py b/nemubot/tools/xmlparser/node.py
index 7df255e..8523771 100644
--- a/nemubot/tools/xmlparser/node.py
+++ b/nemubot/tools/xmlparser/node.py
@@ -124,9 +124,12 @@ class ModuleState:
     def setIndex(self, fieldname="name", tagname=None):
         """Defines an hash table to accelerate childs search.
         You have just to define a common attribute"""
-        self.index = self.tmpIndex(fieldname, tagname)
         self.index_fieldname = fieldname
         self.index_tagname = tagname
+        self._updateIndex()
+
+    def _updateIndex(self):
+        self.index = self.tmpIndex(self.index_fieldname, self.index_tagname)
 
     def __contains__(self, i):
         """Return true if i is found in the index"""
@@ -135,6 +138,10 @@ class ModuleState:
         else:
             return self.hasAttribute(i)
 
+    def update(self, *args, **kwargs):
+        self.attributes.update(*args, **kwargs)
+        self._updateIndex()
+
     def hasAttribute(self, name):
         """DOM like method"""
         return (name in self.attributes)