diff --git a/discord/ext/commands/__init__.py b/discord/ext/commands/__init__.py
index 616e89100..0bf1590e1 100644
--- a/discord/ext/commands/__init__.py
+++ b/discord/ext/commands/__init__.py
@@ -10,7 +10,7 @@ An extension module to facilitate creation of bot commands.
 :license: MIT, see LICENSE for more details.
 """
 
-from .bot import Bot, when_mentioned
+from .bot import Bot, when_mentioned, when_mentioned_or
 from .context import Context
 from .core import *
 from .errors import *
diff --git a/discord/ext/commands/bot.py b/discord/ext/commands/bot.py
index 3f4559d23..1c3885046 100644
--- a/discord/ext/commands/bot.py
+++ b/discord/ext/commands/bot.py
@@ -51,6 +51,27 @@ def when_mentioned(bot, msg):
     to being mentioned, e.g. ``@bot ``."""
     return '{0.user.mention} '.format(bot)
 
+def when_mentioned_or(*prefixes):
+    """A callable that implements when mentioned or other prefixes provided.
+
+    Examples
+    ---------
+
+    .. code-block:: python
+
+        bot = commands.Bot(command_prefix=commands.when_mentioned_or('!'))
+
+    See Also
+    ----------
+    :func:`when_mentioned`
+    """
+    def inner(bot, msg):
+        r = list(prefixes)
+        r.append('{0.user.mention} '.format(bot))
+        return r
+
+    return inner
+
 @asyncio.coroutine
 def _default_help_command(ctx, *commands : str):
     """Shows this message."""