diff -r c241831a91f2 Doc/library/unittest.rst
--- a/Doc/library/unittest.rst	Wed May 01 00:15:44 2013 +0200
+++ b/Doc/library/unittest.rst	Wed May 01 10:57:01 2013 -0400
@@ -1809,6 +1809,10 @@
       if __name__ == '__main__':
           unittest.main(verbosity=2)
 
+   The *defaultTest* argument takes a single test name. If not specified or ``None``, 
+   all tests found in *module* or tests passed via *argv* are run. Tests passed into 
+   *argv* take precendence over those passed via *defaultTest*.
+
    The *argv* argument can be a list of options passed to the program, with the
    first element being the program name.  If not specified or ``None``,
    the values of :data:`sys.argv` are used.