Better wording.

README.rst

@@ -226,7 +226,7 @@ Changelog
 ---------
 
 * `0.2.3dev <https://github.com/jkbr/httpie/compare/0.2.2...master>`_
-    * --auth now prompts for a password if none is provided.
+    * --auth now prompts for a password if only a username provided.
     * Added support for request payloads from a file path with automatic ``Content-Type`` (``http URL @/path``).
     * Fixed missing query string when displaing the request headers via ``--verbose``.
     * Fixed Content-Type for requests with no data.

httpie/cli.py

@@ -126,7 +126,7 @@ parser.add_argument(
     '--auth', '-a', type=cliparse.AuthCredentialsType(cliparse.SEP_COMMON),
     help=_('''
         username:password.
-        If the password is omitted (-a username), HTTPie will prompt for it.
+        If only the username is provided (-a username), HTTPie will prompt for the password.
     '''),
 )
 

httpie/cliparse.py

@@ -230,6 +230,7 @@ class AuthCredentials(KeyValue):
 
     """
     def _getpass(self, prompt):
+        # To allow mocking.
         return getpass.getpass(prompt)
 
     def has_password(self):