-In the example above `cmd` in not an actual MPD command, for a list of
-supported commands, their arguments (as MPD currently understands
-them), and the functions used to parse their responses see :ref:`commands`.
+The MPD command protocol exchanges line-based text records. The client emits a
+command with optional arguments. In the example above the client sends a
+`setvol` command with the string argument `42`.
+
+MPD commands are exposed as :py:class:`musicpd.MPDClient` methods. Methods
+**arguments are python strings**. Some commands are composed of more than one word
+(ie "**tagtypes [disable|enable|all]**"), for these use a `snake case`_ style to
+access the method. Then **"tagtypes enable"** command is called with
+**"tagtypes_enable"**.
+
+Remember MPD protocol is text based, then all MPD command arguments are UTF-8
+strings. In the example above, an integer can be used as argument for the
+`setvol` command, but it is then evaluated as a string when the command is
+written to the socket. To avoid confusion use regular string instead of relying
+on object string representation.
+
+:py:class:`musicpd.MPDClient` methods returns different kinds of objects
+depending on the command. Could be :py:obj:`None`, a single object as a
+:py:obj:`str` or a :py:obj:`dict`, a list of :py:obj:`dict`.