diff --git a/doc/conf.py b/doc/conf.py
index 9d917534..bc6f9de1 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -87,8 +87,8 @@ extensions = ['sphinx.ext.autodoc',
               #'sphinx.ext.doctest'
               'sphinx.ext.viewcode',
               'sphinx.ext.pngmath'
-              #'ipython_directive',
-              #'ipython_console_highlighting.py'
+              'ipython_directive',
+              'ipython_console_highlighting.py'
               #'matplotlib.sphinxext.mathmpl',
               #'matplotlib.sphinxext.only_directives',
               #'matplotlib.sphinxext.plot_directive',
diff --git a/doc/tuto_GP_regression.rst b/doc/tuto_GP_regression.rst
index 08931834..fb367848 100644
--- a/doc/tuto_GP_regression.rst
+++ b/doc/tuto_GP_regression.rst
@@ -2,10 +2,10 @@
 Gaussian process regression tutorial
 *************************************
 
-#.. ipython:: python
-#
-#    print "Hello world"
-#    X = [[1, 10], [1, 20], [1, -2]]
+.. ipython:: python
+
+    print "Hello world"
+    X = [[1, 10], [1, 20], [1, -2]]
 
 We will see in this tutorial the basics for building a 1 dimensional and a 2 dimensional Gaussian process regression model, also known as a kriging model.