Explain that you may have to kill ./plot_image.py's interactive plot.

diff --git a/src/plot_image/plot_image.py b/src/plot_image/plot_image.py
index c77cfd678339e3c0a38dd5f27b2fca2aa7c5f36c..188a73d4a1bf6a6947f874cd70d52511a0b20bf8 100755 (executable)
--- a/src/plot_image/plot_image.py
+++ b/src/plot_image/plot_image.py
@@ -16,9 +16,14 @@ For  usage info, run::
 
     ./plot_image.py --help
 
-For other ideas, see the Matplotlib website [1]_.
+When run with interactive output (i.e. no `-o ...` option), the
+interactive figure is displayed using `pylab.show`, which means that
+you'll have to kill `plot_image.py` using ^C or similar [1]_.
 
-.. [1] http://matplotlib.sourceforge.net/
+For other ideas, see the Matplotlib website [2]_.
+
+.. [1] http://matplotlib.sourceforge.net/faq/howto_faq.html#use-show
+.. [2] http://matplotlib.sourceforge.net/
 """
 
 import optparse