Update install.rst

docs/install.rst

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 Installation
 ============
 
+pVAC-Seq is written for Linux but some users have been able to run it successfully on Mac OS X. If you are using Windows you will need to set up a Linux environment, for example by setting up a virtual machine.
+
 pVAC-Seq requires Python 3.5. Before running any installation steps check the Python version installed on your system:
 
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 .. note::
 
    Running the ``configure`` script requires a Python 2 environment. If you are currently emulating a Python 3 environment with Conda you will need to run ``source deactivate`` before executing the ``configure`` script.
+
+.. note::
+
+   IEDB requires tcsh. You can install it by running `sudo apt get install tcsh`.