diff --git a/02_hash_maps/hm.py b/02_hash_maps/hm.py
index de316e9..7a7cc69 100644
--- a/02_hash_maps/hm.py
+++ b/02_hash_maps/hm.py
@@ -1,7 +1,7 @@
 """
 HashMap Table Implementation
 
-Collisions are not handled in this version.
+Collisions are handled in the neighbour and Table versions.
 
 @jlengrand
 2013/11
diff --git a/03_MergeSort/ms.py b/03_MergeSort/ms.py
new file mode 100644
index 0000000..5e16cbf
--- /dev/null
+++ b/03_MergeSort/ms.py
@@ -0,0 +1,28 @@
+"""
+Implementation of the MergeSort algorithm
+
+@jlengrand
+2013/12
+"""
+
+class TableSorter():
+    """
+    A utili=ty that provides way to sort arrays of elements.
+    It should be possible to compare elements to each others
+    (meaning a > b and a == b should make sense).
+    """
+
+    #empty for now
+    def __init__(self):
+        pass
+
+    def mergeSort(self, table, idx_min=1, idx_max=None):
+        """
+        Returns the table array sorted between
+        indices idx_min and idx_max using the merge sort algorithm
+        """
+        if idx_max == None:
+            idx_max = len(table)
+
+        #TODO: Implement
+        return None
diff --git a/03_MergeSort/ms_test.py b/03_MergeSort/ms_test.py
new file mode 100644
index 0000000..9ed627f
--- /dev/null
+++ b/03_MergeSort/ms_test.py
@@ -0,0 +1,13 @@
+"""
+Unit Tests for the MergeSort implementation
+@jlengrand
+2013/12
+"""
+
+from ms import TableSorter
+
+import unittest
+
+class test_table_sorter(unittest.TestCase):
+
+    #TODO: Implement
\ No newline at end of file