README.md in archer-rails-0.1.1 vs README.md in archer-rails-0.2.0

@@ -57,10 +57,12 @@
 
 ```ruby
 Archer.clear
 ```
 
+You should do this after running sensitive commands.
+
 ## Configuration
 
 Change the number of commands to remember
 
 ```ruby
@@ -103,5 +105,13 @@
 
 - [Report bugs](https://github.com/ankane/archer/issues)
 - Fix bugs and [submit pull requests](https://github.com/ankane/archer/pulls)
 - Write, clarify, or fix documentation
 - Suggest or add new features
+
+To get started with development:
+
+```sh
+git clone https://github.com/ankane/archer.git
+cd archer
+bundle install
+```