@@ -85,8 +85,8 @@ When running _xdot.py_ from its source tree, you can run it by first setting `PY

 You can also pass the following options:

-    Usage: 

-    	xdot.py [file]

+    Usage:

+    	xdot.py [file|-]

     Options:

       -h, --help            show this help message and exit

@@ -109,7 +109,7 @@ You can also pass the following options:

       Ctrl-drag                 zoom in/out

       Shift-drag                zooms an area

-If no input file is given then it will read the dot graph from the standard input.

+If `-` is given as input file then _xdot.py_ will read the dot graph from the standard input.

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