@@ -77,6 +77,14 @@ Usage

 Command Line

 ------------

+If you install _xdot.py_ from PyPI or from your Linux distribution package managing system, you should have the `xdot` somewhere in your `PATH` automatically.

+

+When running _xdot.py_ from its source tree, you can run it by first setting `PYTHONPATH` environment variable to the full path of _xdot.py_'s source tree, then running:

+

+    python3 -m xdot

+

+You can also pass the following options:

+

     Usage: 

     	xdot.py [file]