Renamed Installation section for mandriva and added Theano update doc.

doc/install.txt

@@ -83,13 +83,20 @@ Benjamin J. McCann provides `installation documentation
 <http://www.benmccann.com/dev-blog/installing-cuda-and-theano/>`_ for
 Ubuntu 11.04 with CUDA 4.0 PPA.
 
-Gentoo
-~~~~~~
+Alternative installation on Gentoo
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Brian Vandenberg emailed `installation instructions on Gentoo
 <http://groups.google.com/d/msg/theano-dev/-8WCMn2FMR0/bJPasoZXaqoJ>`_,
 focusing on how to install the appropriate dependencies.
 
+Alternative installation on Mandriva 2010.2
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+A contributor made rpm package for Mandriva_ 2010.2 of Theano 0.3.1.
+
+.. _Mandriva: http://mib.pianetalinux.org/mib/quick/basic-rpms/mib-rpms/975-theano-031
+
 
 .. _linux_basic:
 
@@ -144,12 +151,32 @@ directory; see the `virtualenv documentation`_ for details.
 
 .. _install_bleeding_edge:
 
-With rpm package
-~~~~~~~~~~~~~~~~
+Updating Theano
+~~~~~~~~~~~~~~~
 
-A contributor made rpm package for Mandriva_ 2010.2 of Theano 0.3.1.
+The following command will update only Theano:
+
+.. code-block:: bash
+
+    sudo pip install --upgrade --no-deps theano
+
+The following command will update Theano and Numpy/Scipy (warning bellow):
+
+.. code-block:: bash
+
+    sudo pip install --upgrade theano
+
+
+If you installed numpy/scipy with yum/apt-get, updating numpy/scipy
+this way is not always a good idea. This can make Theano crash due to
+problem with Blas (We will try to fix them). But, this can also result
+in slower version of Theano and Numpy. To fix the crash, you can
+delete Theano cache like this:
+
+.. code-block:: bash
+
+    theano-cache clear
 
-.. _Mandriva: http://mib.pianetalinux.org/mib/quick/basic-rpms/mib-rpms/975-theano-031
 
 Bleeding-edge install instructions
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~