README.md in pronto-infer-0.1.0 vs README.md in pronto-infer-0.1.1

@@ -9,20 +9,22 @@
 ## Configuration
 
 You need to specify location of infer output by passing `PRONTO_INFER_OUT_DIR` env variable e.g:
 
 ```bash
-PRONTO_INFER_OUT_DIR=infer-out run --index
+> export PRONTO_INFER_PROJECT_ROOT_DIR=. # NOTE: optional
+> export PRONTO_INFER_OUT_DIR=infer-out 
+> pronto run --index
 ```
 
 See [seikichi/pronto-infer-example](https://github.com/seikichi/pronto-infer-example) for more details.
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'pronto-infer
+gem 'pronto-infer'
 ```
 
 And then execute:
 
     $ bundle