README.md in heroku-resque-workers-scaler-0.2.1 vs README.md in heroku-resque-workers-scaler-0.3.0

@@ -24,11 +24,11 @@
 `Go to your https://api.heroku.com/account`
 
 ```
 heroku config:add HEROKU_API_KEY=your_api_key -a your_app_name
 heroku config:add HEROKU_APP_NAME=your_app_name -a your_app_name
-heroku config:add export SAFE_MODE=true -a your_app_name
+heroku config:add SAFE_MODE=true -a your_app_name
 ```
 
 ## Run localy
 
 You can test when executed this :
@@ -56,17 +56,20 @@
 
 You can change the thresholds, environments of execution and the name of your worker process in your project on config/scaler_config.yml
 
 Exmple YAML file contents:
 
+    mode: :thresholds # :fit, :half, :third
     thresholds:
     - :workers: 1
       :job_count: 1
     - :workers: 2
       :job_count: 15
     environments:
       - production
     worker_name: resque
+
+if you use `mode: :fit` the number of job is exactly the same of available worker, `:half` the number of worker is 1/2 of number of job in queue, and for `third` 1/3
 
 I just bundled it into a gem for easy inclusion into other projects.
 
 #### Usage