Update README.md

Author: hippke

README.md

@@ -27,7 +27,7 @@ cd tls
 python setup.py install
 ```
 
-If the command `python` does not point to Python 3 on your machine, you can try to replace the last line with `python3 setup.py install`. If you don't have `git` on your machine, you can find installation instructions [here](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git).
+If the command `python` does not point to Python 3 on your machine, you can try to replace the last line with `python3 setup.py install`. If you don't have `git` on your machine, you can find installation instructions [here](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git). TLS also runs on Python 2, but without multi-threading.
 
 
 Dependencies: