diff --git a/README.html b/README.html
index 1ccfb2e..070994b 100644
--- a/README.html
+++ b/README.html
@@ -322,10 +322,10 @@ <h3>Counting neighbours</h3>
 corresponds to the formula above applied individually to each element. Said
 differently, we have <tt class="docutils literal"><span class="pre">(1+(2*Z+3))[i,j]</span> == <span class="pre">(1+(2*Z[i,j]+3))</span></tt> for any i,j.</p>
 <p>Ok, so far, so good. Now what happens if we add Z with one of its subpart,
-let's say <tt class="docutils literal"><span class="pre">Z[-1:1,-1:1]</span></tt> ?</p>
+let's say <tt class="docutils literal"><span class="pre">Z[1:-1,1:-1]</span></tt> ?</p>
 <blockquote>
 <pre class="doctest-block">
-&gt;&gt;&gt; Z + Z[-1:1,-1:1]
+&gt;&gt;&gt; Z + Z[1:-1,1:-1]
 Traceback (most recent call last):
 File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
 ValueError: operands could not be broadcast together with shapes (6,6) (4,4)
diff --git a/README.rst b/README.rst
index 4b4e896..0fb3b3b 100644
--- a/README.rst
+++ b/README.rst
@@ -18,13 +18,12 @@ Sources are available from `github <https://github.com/rougier/numpy-tutorial>`_
 All code and material is licensed under a `Creative Commons
 Attribution-ShareAlike 4.0 <http://creativecommons.org/licenses/by-sa/4.0>`_.
 
-Tutorial can be read at http://www.labri.fr/perso/nrougier/teaching/numpy/numpy.html
 
 See also:
+ * `From Python to Numpy <https://www.labri.fr/perso/nrougier/from-python-to-numpy/>`_
  * `Matplotlib tutorial <http://www.labri.fr/perso/nrougier/teaching/matplotlib/matplotlib.html>`_
  * `100 Numpy exercices <http://www.labri.fr/perso/nrougier/teaching/numpy.100/index.html>`_
 
-
 Introduction
 ============
 
@@ -328,9 +327,9 @@ corresponds to the formula above applied individually to each element. Said
 differently, we have ``(1+(2*Z+3))[i,j] == (1+(2*Z[i,j]+3))`` for any i,j.
 
 Ok, so far, so good. Now what happens if we add Z with one of its subpart,
-let's say ``Z[-1:1,-1:1]`` ?
+let's say ``Z[1:-1,1:-1]`` ?
 
-  >>> Z + Z[-1:1,-1:1]
+  >>> Z + Z[1:-1,1:-1]
   Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   ValueError: operands could not be broadcast together with shapes (6,6) (4,4)  
@@ -590,7 +589,7 @@ obtained via the `finite difference method
               Z[1:-1,0:-2] - 4*Z[1:-1,1:-1] + Z[1:-1,2:] +
                                Z[2:  ,1:-1] )
 
-Finally, we can iterate the computation after havong choosed some interesting parameters::
+Finally, we can iterate the computation after choosing some interesting parameters::
 
   for i in range(25000):
       Lu = laplacian(U)