Improve help message for the --quiet-level option

codespell_lib/_codespell.py

@@ -262,13 +262,17 @@ def parse_options(args):
 
     parser.add_argument('-q', '--quiet-level',
                         action='store', type=int, default=2,
-                        help='Bitmask that allows codespell to run quietly. '
+                        help='Bitmask that allows suppressing some messages. '
                              '0: print all messages. 1: disable warnings about'
                              ' wrong encoding. 2: disable warnings about '
-                             'binary files. 4: omit warnings about automatic '
-                             'fixes that were disabled in dictionary. '
-                             '8: don\'t print anything for non-automatic '
-                             'fixes. 16: don\'t print fixed files.')
+                             'binary files (this is the default level). 4: '
+                             'omit warnings about automatic fixes that were '
+                             'disabled in the dictionary. 8: don\'t print '
+                             'anything for non-automatic fixes. 16: don\'t '
+                             'print the list of fixed files. As usual with '
+                             'bitmasks, these levels can be combined; e.g. use'
+                             ' 3 to mean 1+2, 7 for 1+2+4, 23 for 1+2+4+16, '
+                             'etc.')
 
     parser.add_argument('-e', '--hard-encoding-detection',
                         action='store_true', default=False,