added comment regarding pyinstaller

README.md

@@ -11,3 +11,11 @@ Python 3.6, the developementversion is needed:
 ~~~
 pip install https://github.com/pyinstaller/pyinstaller/tarball/develop
 ~~~
+
+But I found out that Pyintaller and multiprocessing on windows don't mix well.
+Even after some research and trying the [recipie from the pyinstaller wiki][1]
+it just won't work.
+
+I will try to investigate further, if I find the time for it [...]
+
+[1]: https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Multiprocessing