README.md in telvue_state_machine-1.2.1 vs README.md in telvue_state_machine-1.2.2

@@ -67,9 +67,15 @@
 Examples of the usage patterns for some of the above features are shown below.
 You can find much more detailed documentation in the actual API.
 
 ## Usage
 
+Add to your gemfile:
+
+``` ruby
+gem 'telvue_state_machine', require: 'state_machine'
+```
+
 ### Example
 
 Below is an example of many of the features offered by this plugin, including:
 
 * Initial states