README.rdoc in defog-0.3.0 vs README.rdoc in defog-0.3.1

@@ -48,10 +48,10 @@
         defog.file("key/of/file", mode) do |file|
            # ... access file ...
         end
 
 <code>mode</code> can be "r", "r+", "w", "w+", "a", or "a+" with the usual
-semantics. 
+semantics, and can be suffixed with "b" or with ":" and encoding as usual.
 
 When opened in a readable mode ("r", "r+", "w+", "a+"), first caches the
 cloud file in the local proxy.  When opened in a writeable mode ("r+", "w",
 "w+", "a", "a+"), arranges to upload the changes back to the cloud file
 at close time.