Expand acronym

Author: SteveBarnett

sites/en/intro-to-rails/intro-to-rails.step

@@ -23,7 +23,7 @@ application online you should understand:
 * How to try your Ruby code (IRB)
 * How to go from requirements to a new working Rails application
 * How to get your application online
-* The basic tools a RoR developer uses (source control, editor, console, local server)
+* The basic tools a RoR (Ruby on Rails) developer uses (source control, editor, console, local server)
 
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