diff --git a/pygraph/__init__.py b/pygraph/__init__.py
index 42f83b5..3eafadb 100644
--- a/pygraph/__init__.py
+++ b/pygraph/__init__.py
@@ -1,5 +1,4 @@
 # -*-coding:utf-8 -*-
-
 """
 Pygraph
 
@@ -9,20 +8,14 @@ This  package contains 4 sub  packages :
         * kernels : computation of graph kernels, ie graph similarity measure compatible with SVM
         * notebooks : examples of code using this library
         * utils : Diverse computation on graphs
- 
-je vous passe le blabla
- 
 """
- 
+
 # info
 __version__ = "0.1"
 __author__  = "Benoit Gaüzère"
 __date__    = "November 2017"
  
 # import sub modules
-from c_ext import lsape_binders
-from ged import bipartiteGED
-from ged import costfunctions
-from ged import GED
-from utils import graphfiles
-from utils import utils
+from pygraph import c_ext
+from pygraph import ged
+from pygraph import utils
diff --git a/pygraph/c_ext/__init__.py b/pygraph/c_ext/__init__.py
new file mode 100644
index 0000000..7101e7e
--- /dev/null
+++ b/pygraph/c_ext/__init__.py
@@ -0,0 +1,17 @@
+# -*-coding:utf-8 -*-
+"""Pygraph - c_ext module
+
+This package binds some C++ code to python 
+
+lsape_binders.py : binders to C++ code of LSAPE methods implemented in 
+https://bougleux.users.greyc.fr/lsape/
+
+"""
+
+# info
+__version__ = "0.1"
+__author__ = "Benoit Gaüzère"
+__date__ = "November 2017"
+
+# import sub modules
+from pygraph.c_ext import lsape_binders
diff --git a/pygraph/ged/__init__.py b/pygraph/ged/__init__.py
new file mode 100644
index 0000000..7f5b1bc
--- /dev/null
+++ b/pygraph/ged/__init__.py
@@ -0,0 +1,17 @@
+# -*-coding:utf-8 -*-
+"""Pygraph - ged module
+
+Implement some methods to compute ged between graphs
+
+
+"""
+
+# info
+__version__ = "0.1"
+__author__ = "Benoit Gaüzère"
+__date__ = "November 2017"
+
+from pygraph.ged import costfunctions
+from pygraph.ged import bipartiteGED
+from pygraph.ged import GED
+
diff --git a/pygraph/utils/__init__.py b/pygraph/utils/__init__.py
new file mode 100644
index 0000000..501d1aa
--- /dev/null
+++ b/pygraph/utils/__init__.py
@@ -0,0 +1,17 @@
+# -*-coding:utf-8 -*-
+"""Pygraph - utils module
+
+Implement some methods to manage graphs
+ graphfiles.py : load .gxl and .ct files
+ utils.py : compute some properties on networkX graphs
+
+
+"""
+
+# info
+__version__ = "0.1"
+__author__ = "Benoit Gaüzère"
+__date__ = "November 2017"
+
+from pygraph.utils import graphfiles
+from pygraph.utils import utils