Clarifications to the README update

README.rst

@@ -4,7 +4,12 @@ xattr
 .. image:: https://travis-ci.org/xattr/xattr.svg?branch=master
     :target: https://travis-ci.org/xattr/xattr
 
-xattr is a Python script wrapper for viewing and editing extended filesystem attributes on the command line. It is provided as an alternative to getfattr, setfattr, etc. for Unix-y environments that don't have those.
+xattr is a Python wrapper for extended filesystem attributes.
+
+xattr also ships with an `xattr` command line tool for viewing and
+editing extended filesystem attributes. On platforms that support or
+ship with the attr package, you may prefer to use the `getfattr`
+and `setfattr` command line tools from the attr package.
 
 Extended attributes extend the basic attributes of files and directories
 in the file system.  They are stored as name:data pairs associated with