better naming + update dependecies in the documentation

README.md

@@ -4,7 +4,7 @@
 *Note:* This program uses the [music21](https://github.com/cuthbertLab/music21) library.
 
 ## Dependencies
-You can install the only python module that is not in the default library using pip:
+First of all you need [python3](https://www.python.org/downloads/) including the standard librarys. Now install the only needed additional module using pip:
 
 	pip install music21
 

doc/documentation.html

@@ -34,7 +34,7 @@ div {
 
 <h2>Dependencies</h2>
 
-<p>You can install the only python module that is not in the default library using pip:</p>
+<p>First of all you need <a href="https://www.python.org/downloads/">python3</a> including the standard librarys. Now install the only needed additional module using pip:</p>
 
 <div><pre><code>pip install music21
 </code></pre></div>