diff --git a/anubis_dev/library/tools/2-4tree.anubis b/anubis_dev/library/tools/2-4tree.anubis
index 5afce60..7a09438 100644
--- a/anubis_dev/library/tools/2-4tree.anubis
+++ b/anubis_dev/library/tools/2-4tree.anubis
@@ -1,6 +1,6 @@
   Author       : Matthieu Herrmann
   Creation     : 2014/04/14
-  Last update  : 2014/04/15 14:16 by matthieu@embryo (inserted by vim).
+  Last update  : 2014/04/15 16:54 by matthieu@embryo (inserted by vim).
   ======================================================================================================================
   Library import:
 read tools/iterators.anubis
@@ -139,6 +139,9 @@ type Tree($Entry):
   empty(($Entry, $Entry) -> BTree24Compare compare),
   tree(Node($Entry) root, ($Entry, $Entry) -> BTree24Compare compare).
 
+    Construction of a new tree:
+public define Tree($Entry) new_tree( ($Entry, $Entry) -> BTree24Compare compare ) = empty(compare).
+
     This type is used as the result of an insertion: when an entry is inserted in the tree, an other can be "rejected",
   i.e. in a completed 4-leaf or 4-node. The rejected entry must be fused at the parent level, while "rewiding" the
   recursive calls.
@@ -1144,7 +1147,7 @@ public define Iterator(($Key, $Value)) take_right(TreeKV($Key, $Value) tkv) = co
   = Testing part =======================================================================================================
   ======================================================================================================================
 
-
+  read tools/basis.anubis
 
   define One printTree(Node(Int) node) = if node is
   {
--
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