Improve help message for the --quiet-level option

codespell_lib/_codespell.py

@@ -262,13 +262,16 @@ 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 '
-                             'file. 4: shut down warnings about automatic '
-                             'fixes that were disabled in dictionary. '
-                             '8: don\'t print anything for non-automatic '
-                             'fixes. 16: don\'t print fixed files.')
+                             'files (this is the default level). 4: omit '
+                             'warnings about automatic fixes that were '
+                             'disabled in dictionary. 8: don\'t print anything '
+                             'for non-automatic fixes. 16: don\'t print the '
+                             'list of fixed files. As usual with bitmaps, 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,