diff --git a/docs/commands/mopidy.rst b/docs/commands/mopidy.rst
index c03a40cf..f3e3d46b 100644
--- a/docs/commands/mopidy.rst
+++ b/docs/commands/mopidy.rst
@@ -84,8 +84,8 @@ Extension sub-commands
 ======================
 
 Additionally, extensions can provide extra sub-commands. See ``mopidy --help``
-for a list of what is availbale on your system and ``mopidy COMMAND --help``
-for command specific help. Sub-commands for disabled extensions will be listed,
+for a list of what is available on your system and ``mopidy COMMAND --help``
+for command-specific help. Sub-commands for disabled extensions will be listed,
 but can not be run.
 
 .. cmdoption:: local
diff --git a/docs/extensiondev.rst b/docs/extensiondev.rst
index 9c8464f6..05fe27c9 100644
--- a/docs/extensiondev.rst
+++ b/docs/extensiondev.rst
@@ -353,7 +353,8 @@ Example backend
 
 If you want to extend Mopidy to support new music and playlist sources, you
 want to implement a backend. A backend does not have access to Mopidy's core
-API at all and have a bunch of interfaces to implement.
+API at all, but it does have a bunch of interfaces it can implement to extend
+Mopidy.
 
 The skeleton of a backend would look like this. See :ref:`backend-api` for more
 details.
diff --git a/mopidy/backends/base.py b/mopidy/backends/base.py
index e2ef9758..23832cdb 100644
--- a/mopidy/backends/base.py
+++ b/mopidy/backends/base.py
@@ -306,9 +306,9 @@ class BaseSubCommandProvider(object):
 
         *MUST be implemented by subclass.*
 
-        :param args: the argments object from argpase.
-        :param config: read-only version of the mopidy config.
-        :param extensions: list of enabled extensions.
-        :returns: integer exit value for the process.
+        :param args: the argments object from argparse
+        :param config: read-only version of the mopidy config
+        :param extensions: list of enabled extensions
+        :returns: integer exit value for the process
         """
         raise NotImplementedError