diff --git a/flake8/main/cli.py b/flake8/main/cli.py
index 05af72e..7f58fb2 100644
--- a/flake8/main/cli.py
+++ b/flake8/main/cli.py
@@ -127,11 +127,6 @@ def register_default_options(option_manager):
 
     # Config file options
 
-    add_option(
-        '--isolated', default=False, action='store_true',
-        help='Ignore all found configuration files.',
-    )
-
     add_option(
         '--append-config', action='append',
         help='Provide extra config files to parse in addition to the files '
@@ -140,6 +135,18 @@ def register_default_options(option_manager):
              'provide the same option.',
     )
 
+    add_option(
+        '--config', default=None,
+        help='Path to the config file that will be the authoritative config '
+             'source. This will cause Flake8 to ignore all other '
+             'configuration files.'
+    )
+
+    add_option(
+        '--isolated', default=False, action='store_true',
+        help='Ignore all found configuration files.',
+    )
+
 
 def main(argv=None):
     """Main entry-point for the flake8 command-line tool."""