README.md in translate_self-0.5.0 vs README.md in translate_self-0.6.0

@@ -17,12 +17,16 @@
 
 ```sh
 export DEEPL_AUTH_KEY="your-api-token"
 ```
 
-This gem currently hardcodes the free DeepL servers. # TODO 
+By default this gem uses the free DeepL servers, but you can also configure your own:
 
+```sh
+export DEEPL_HOST="non-free-host"
+```
+
 Now you can translate it to your language of chose with this gem!
 ```ruby
 "hello world".translate_to_ja
 # 世界よ、ハローだ
 ```
@@ -89,9 +93,26 @@
 ```ruby
 hello = TranslatableString.new('hello', language: 'en', to_language: 'fi')
 hello.translate
 # "Moi"
 ```
+
+## Benchmark
+
+Create a string 5000000 times. 
+
+```shell
+C:\home\sampo\translate_self> ruby benchmark.rb
+Rehearsal -------------------------------------------------------
+normal string         0.252435   0.000000   0.252435 (  0.252490)
+translatable string   0.299736   0.000000   0.299736 (  0.299789)
+---------------------------------------------- total: 0.552171sec
+
+                          user     system      total        real
+normal string         0.237091   0.000000   0.237091 (  0.237091)
+translatable string   0.237607   0.000000   0.237607 (  0.237611)
+```
+So... the overhead might be surprisingly low!
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.