updating readme

README.markdown

@@ -44,14 +44,15 @@ with `PandocRuby.bin_path = '/path/to/bin'`
 
 For more information on Pandoc, see the [Pandoc documentation](http://johnmacfarlane.net/pandoc/) or run `man pandoc`.
 
-If you'd prefer a faster, pure-Ruby extended markdown interpreter that can output a few different formats, take a look at [Maruku](http://maruku.rubyforge.org/).
+If you'd prefer a pure-Ruby extended markdown interpreter that can output a few different formats, take a look at [Maruku](http://maruku.rubyforge.org/).
 
 This gem was inspired by [Albino](http://github.com/github/albino).
 
 ## Caveats
 
 * This has only been tested on *nix systems.
-* Some conversions may still not work and/or require additional dependencies.
+* ODT is not currently supported.
+* PDF conversions may require additional dependencies.
 
 ## Note on Patches/Pull Requests