Slight rewording in docs about SIP

docs/guides/main.rst

@@ -72,7 +72,15 @@ new versions.
 Installing on macOS 10.11 and Higher
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Starting with macOS 10.11 (El Capitan), Apple has enabled `System Integrity Protection`_ (SIP), and because of SIP, some installation processes may fail, even with ``sudo``, because they intrude on protected areas of the system (if you've installed python via `Homebrew`_ this probably won't happen since the Python libraries are installed to an unrestricted folder). If this does happen, try installing beets only for the current user by running ``pip install --user beets``. It might also be a good idea to add ``~/Library/Python/2.7/bin`` to your ``$PATH``.
+Starting with version 10.11 (El Capitan), macOS has a new security feature
+called `System Integrity Protection`_ (SIP) that prevents you from modifying
+some parts of the system. This means that some ``pip`` commands may fail with
+a permissions error, even when you use ``sudo``. (You probably *won't* run
+into this if you've installed Python yourself with `Homebrew`_ or otherwise.)
+
+If this happens, you can install beets for the current user only (sans
+``sudo``) by typing ``pip install --user beets``. If you do that, you might want
+to add ``~/Library/Python/2.7/bin`` to your ``$PATH``.
 
 .. _System Integrity Protection: https://support.apple.com/en-us/HT204899
 .. _Homebrew: http://brew.sh