README.md in dbox-0.6.15 vs README.md in dbox-0.7.0

@@ -261,14 +261,5 @@
 
 > Dbox.pull("/tmp/public")
 > File.read("#{ENV['HOME']}/Dropbox/Public/hello.txt")
 => "Oh, Hello"
 ```
-
-Advanced
---------
-
-To speed up your syncs, you can manually set the number concurrent dropbox operations to execute. (The default is 2.)
-
-```sh
-$ export DROPBOX_CONCURRENCY=5
-```